"I know you from somewhere!" and "Were you on TV?" are just two of the things that once-famous celebs hear from strangers on probably a regular basis if they decide to step out of the comfort of their homes. Because of how cutthroat the entertainment industry can be, artists truly have to take a gamble if they want to keep getting jobs. For some of the celebrities on the list, they lucked out—but only once. Some of them used to be in massive films and others are musicians whose songs we used to hear over and over again in the past. But fame is fleeting, and many celebrities have fallen victim to the passing of time. Here are 15 celebs many of us have already forgotten.

15 Lacey Chabert

Lacey Chabert launched her acting career in the 1990s with Party of Five, later transitioning to film roles. She most notably appeared in Not Another Teen Movie and Mean Girls, but has since seemed to fall off the radar. Back in 2007, she attempted to relaunch her TV career with a pilot for The Hot Years, which unfortunately was not picked up by FOX. Most recently, she once again made her way to the small screen with Baby Daddy. Given that she couldn't replicate her success with Mean Girls, the actress started doing Hallmark films, of which she has appeared in 12 since 2010. Her Twitter is filled with photos of herself with her Hallmark co-stars as well, giving us a glimpse of her low-key acting career now.

14 Kristin Kreuk

In the early 2000s, Kristin Kreuk captivated audiences worldwide with her role as Lana Lang in the hit TV series Smallville, alongside Tom Welling. Her mixed race features were, at the time, so unique and she was regarded as one of the most beautiful faces on TV. Which is why it came as a surprise to many that she didn't achieve greater success outside of Smallville and the 2001 series Edgemont, where she played Laurel Yeung. She did, however, return to television in 2012 with Beauty & the Beast, which concluded with a fourth season in 2016. Kreuk isn't giving up just yet, though, as she's set to star in a pilot for next year's Burden of Truth, which hopefully will replicate her Smallville success.

13 JoJo

JoJo's “Leave (Get Out)” is one of the most iconic pop songs of the early 2000s. It's undeniably one of the best breakup songs of the decade, along with Kelly Clarkson's “Since U Been Gone". JoJo's 2004 record was followed by another hit, “Too Little Too Late” in 2006, which seemed to be her last major hit. In 2006, she dabbled into acting, starring alongside Emma Roberts in Aquamarine, but failed to replicate her early 2000s success because of troubles with her label, Da Family Entertainment. She was soon released from her contract and was signed by Interscope Records, which she left for Atlantic in 2015. 2016 saw her comeback with Mad Love and in 2017, she had a joint deal with Interscope to form Clover Music.

12 Missy Eliott

Those who grew up in the 2000s would know Missy Elliott as the queen of rap in that era, with hits like "Get Ur Freak On" and "Work It”. While she did reap as much as six Grammy Awards for her work in hip-hop, her musical career slowed down due to health problems. In 2011, Elliott admitted to People Magazine that she had a hyperthyroidism disorder called Graves' disease, which prevented her muscles from performing the simplest tasks like using a pen to write music. Elliott's descent into obscurity began, causing fans to wonder what happened to her. Her last record was released over 12 years ago, and she's definitely long overdue for a new one. She released a song called "I'm Better" in January 2017 but hasn't followed it up either.

11 Shane West

If you were a tween or teen in the early 2000s, you've probably heard of Shane West. He was the actor who played Mandy Moore's brooding love interest Landon Carter in the tear-jerker A Walk To Remember in 2002. He followed it up with Stephen Norrington's The League of Extraordinary Gentlemen, in which he starred with Sean Connery. But the actor hasn’t been able to maintain his popularity. While he has appeared in films sporadically over the last decade, his only most notable work is on television, with his roles as Dr. Ray Barnett in ER from 2004 to 2009, in Nikita in 2010 to 2013 and in Salem from 2014 to 2017. It seems that the actor has been relegated to projects that fall neatly below the radar.

10 Frankie Muniz

Is Malcolm still in the middle? Child star Frankie Muniz rose to fame in 2000 when he starred in Malcolm in the Middle as the titular character. You probably didn't know that he was nominated for an Emmy and two Golden Globe Awards for that role, but like many actors, he had trouble finding more jobs. He delved into car racing in the late 2000s after the show ended. He also tried his hand at writing and producing shows, which didn't go well either. In 2012, he joined a band called Kingsfoil, but left two years later due to scheduling conflicts. He now dedicates his time behind the scenes, managing the band Astro Lasso, which opened for bands like We The Kings. Muniz was last seen on DTWS' season 25.

9 Jessie McCartney

Singer and actor Jesse McCartney was another young star who made it big in the early 2000s with hit songs "Beautiful Soul" and "Because You Live”. But growing up in the spotlight isn't all that easy. When his follow up records showed a more grown-up, mature side to him, it seemed that he had lost his appeal to the younger generation. The singer delved into acting, but never really landed a leading role or a part that actually would stick. He appeared in Army Wives in 2013, and a few recurring roles in other shows. Most recently, he appeared as Reed in Fear the Walking Dead, but still hasn't landed a major role. He has, however, lent his voice to animated films over the years.

8 Rita Ora

Rita Ora is one of those pop stars who come out with a great hit, but struggle to remain relevant in the cutthroat industry that's dominated by the likes of Taylor Swift, Lady Gaga, Nicki Minaj, Beyonce and the likes. Ora broke out with "How We Do (Party)" in 2012 but failed to veer away from the opening act status. To date, she only has one full-length record out and has notably appeared in the Fifty Shades film series. Ora signed on with Atlantic Records in June 2016, but since then has failed to release a new record. She did release "Your Song" this year, but no word yet on a new record, making her one of the more forgettable vocalists of the last decade.

7 Clémence Poésy

Imagine being in one of the world's biggest movie franchises and then never really topping that in your acting career. That’s exactly what happened with Clémence Poésy when she played Beauxbatons Academy student Fleur Delacour in 2005's Harry Potter and the Goblet of Fire and Deathly Hallows Parts 1 and 2 in 2010 and 2011. To date, the Harry Potter series remains to be her biggest project. She did, however, star in 2008's In Brudges with Colin Farrell, James Franco's 127 Hours in 2010 and Michael Caine's Mr. Morgan's Last Love in 2013. But it seems that Poésy has never really stepped out of the supporting role, making fans wonder if she will get a second wind—another chance to be part of an international blockbuster.

6 Jennifer Love Hewitt

Jennifer Love Hewitt was one of the biggest stars of the late 1990s to the 2000s. But her career went into a major slump beginning 2010, making fans wonder: “Whatever happened to her?” Hewitt is best known for her roles as Sarah in FOX's Party of Five, and later launched her film career with the I Know What You Did Last Summer films. In 2002, she made her way to pop mainstream with her record BareNaked, and in 2005 became the face of Melinda Gordon on the series Ghost Whisperer on CBS. But her career slowed down after that, appearing only in The Client List in 2012 and Criminal Minds in 2014. Her last film was in 2012, so she's probably keeping busy raising her family of four.

5 Nikki Blonsky

Getting a big break is one of the biggest challenges in Hollywood, but an even bigger challenge is continuing to find work after that big break. This is very true for stars like Nikki Blonsky, who launched her acting career with Adam Shankman's 2007 film adaptation of Hairspray. In it, she played Tracy Turnblad and was nominated for a Screen Actors Guild Award, a Golden Globe Award and several Broadcast Film Critics Association Awards. She followed up Hairspray with the Lifetime drama TV film, Queen Sized and several low-budget films throughout the last 10 years. Most recently, she had a supporting role in Adam Rifkin's Dog Years. With plus-sized actresses like Chrissy Metz gaining popularity, it wouldn't be surprising if Blonsky relaunches her career with a hit.

4 Pussycat Dolls

The mid-2000s was a crazy, fun time for music. Pop music still dominated radio airplay, which was why dance bands like The Pussycat Dolls were able to carve out their own territory with their own brand of girl power. The seven-piece broke out with "Don't Cha”, which didn’t only peak atop the charts in many countries but also ranked two on the Billboard Hot 100. It was followed up by several other successful singles before the girls strutted away from the band in 2010. Thanks to the ever-changing landscape of pop music, they were easily forgotten, but talk of a reunion in October 2017 generated buzz for the former girl group. Frontwoman Nicole Scherzinger and X Factor judge confirmed the reunion, which is now in the making.

3 Shaggy

If you were a child of the '90s or early aughts, you've surely turned on the radio to hear Shaggy singing one of his many hits: his remake of "Oh Carolina”, "Boombastic”, "It Wasn't Me” and "Angel”. Born Orville Richard Burrell, Shaggy was actually a United States Marine Corps crewman and had served during the Persian Gulf War before embarking on a musical journey. Although he continued to create studio albums throughout the early 2010s, Shaggy wasn't able to recreate his early musical success. He had been collaborating with artists such as Eve and Kylie Minogue in the last few years, but never really made it back to the Billboard Top 100. But hey, at least he got a Grammy Award for Best Reggae Album in 1996 for "Boombastic”.

2 Christina Ricci

Christina Ricci was synonymous to her breakout role—the character of Wednesday Addams in 1991's The Addams Family. She followed it up with roles in Tim Burton's Sleepy Hollow and Monster, for which she received critical praise. Once the aughts progressed, however, it seems that Ricci opted for more low-key or supporting roles. Although she went on to star in several films as the lead, she also did voice roles for films such as Alpha and Omega in 2010, The Smurfs 2 in 2013 and The Hero of Color City in 2014. She once again lent her voice to Teen Titans: The Judas Contract this year, choosing to work behind the scenes and not in front of the camera, most likely to spend more time raising her son, Freddie.

1 Brandon Routh

Through the years, several actors have made their mark playing the role of Superman, and because there are so many of them, only some make a real impact and the others just fall through the cracks. Brandon Routh, who played the DC superhero in Bryan Singer's 2006 film Superman Returns, launched his acting career with the role that would be familiar to audiences worldwide but failed to follow it up with roles of true substance. While he did earn an IGN Award for Best Villain for his role as Daniel in Chuck, it seems that his promising career wasn't so promising after all. Fortunately, The CW is bringing back old superhero faves and cast him as The Atom in the Arrow multiverse. At least he has that going on.