If the music industry was high school, Post Malone would most definitely be voted "most popular". He's THAT guy...the one who is able to befriend anyone, from the jocks to the valedictorian to the party guys.

He is the enigma of the music industry. His music crosses over hip-hop and R&B, with tinges of rock and roll and the blues, but also has pop's easy-to-listen-to appeal. Naturally, his collaborations also cross over, as he's worked with the likes of pop icon, Justin Bieber, Quavo from Migos and rock-and-roll shock artist, Ozzy Osbourne. He's making friends with almost everyone in the industry along the way.

Here are 20 photos that showcase the chart-topping superstar with all his celebrity homies, from different genres and industries.

20 Post Malone and Billie Eilish

When this photo of Post Malone and Billie Eilish hugging made the rounds on the Internet, people were quick to suspect the two were dating, which is not true. The two are just good (and very successful) friends, who headlined the Hangout Music Festival in Alabama, along with the Red Hot Chili Peppers.

19 Post Malone and Justin Bieber

At first glance, pop superstar, Justin Bieber, seems like an unlikely friend for Post Malone, but the two are actually quite close. They made their friendship 'Instagram official' in 2016 and soon after released their chart-topping hit, "Deja Vu".

Apparently, the two are so close, Post was put in charge of putting together Justin Bieber's bachelor party when he got engaged to Hailey Baldwin.

18 Post Malone and 21 Savage

"Beerbongs & Bentleys" marked the sophomore album release of Post Malone, featuring collaborations with the likes of 21 Savage, G-Eazy and Nicki Minaj. The lead single from the album, "Rockstar", with 21 Savage, topped the charts. These two face-tattooed artists went on to win "Song of the Year" at the MTV VMAs.

17 Post Malone and Jaylon Smith

Cowboys fan, Post Malone, got to meet Jaylon Smith, who presented the singer with an official 'Hot Boyz' blinged-out chain. Post's father is the assistant director of food & beverages for the Cowboys. It's sweet to see things come full circle for the Post family.

16 Post Malone and Billie Joe Armstrong

Billie Joe Armstrong, of the iconic punk rock band, Green Day, stopped by backstage at a show Post Malone was headlining in Oakland. From one legend to another, Post passed on his knowledge of beer pong to the rock-and-roll legend. Photographer Grady Brannan posted the fun on Instagram, including blue Solo cups and Bud Light.

15 Post Malone and J Balvin

Columbian reggaeton artist, J Balvin, whose music has steadily climbed the charts, features the likes of Cardi B and Bad Bunny. Balvin expressed his desire to work with Post Malone in an interview. Post returned the sentiment by featuring J Balvin in his music video for "Wow".

14 Post Malone and DJ Khaled

DJ Khaled, the famed producer (and Internet personality), released his 11th album last year, "Father of Asahd", which featured a roster of musical talent, including Post Malone. The two collaborated on "Celebrate", which also featured rapper, Travis Scott.

13 Post Malone and Jimmy Fallon

When Post Malone found out that Jimmy Fallon had never tasted the delicious 'endless breadsticks' and pasta at the 'carb heaven' known as Olive Garden, the two teamed up to film a segment. The segment featured Jimmy trying out Olive Garden for the first time.

In the segment, the two have the greatest time sampling free wine, breadsticks and salads, along with a complimentary birthday cake.

12 Post Malone and Liam Payne

Post Malone slid into Liam Payne's DMs one night, saying, "I love you" to the ex-One Direction member, who previously covered Post's hit song, "Circles". This led to Post reaching out to share thanks.

The anecdote was revealed when Liam was a guest on The Tonight Show Starring Jimmy Fallon, where he also said he would love to collaborate with the singer. Jimmy advised him to take him to Olive Garden to get the ball rolling.

11 Post Malone and Dennis Rodman

Another surprising friend of Post Malone is ex-basketball star and ex-tabloid favorite, Dennis Rodman, who gave the singer a $25 Olive Garden gift card for Christmas. According to Jimmy Fallon, Post celebrates all his big life moments at the pasta chain, so it was a perfectly thoughtful holiday gift.

10 Post Malone and Machine Gun Kelly

Machine Gun Kelly and Post Malone's paths have crossed at various festivals and award ceremonies, so it's not a huge surprise to find out that Post is chill with the rapper. It seems the two go way back, pre-face tattoos for Post, and continue to be buddies today.

9 Post Malone and Seth Rogen

Post Malone appeared in Seth Rogen’s star-studded Hilarity for Charity Netflix special, where the singer joined Craig Robinson and a stage band to cover Mark Morrison’s cheesy slow-jam hit, “Return of the Mack.”

Seth Rogen has previously mentioned that fans have mistaken him for either Jonah Hill or Post Malone, but obviously there were no hard feelings about that, as he invited the singer to perform at his event.

8 Post Malone and Swae Lee

Post Malone and Swae Lee released "Sunflower" in late 2018, and the song became the lead soundtrack song for the Academy Award-winning animated feature, Spider-Man: Into the Spider-Verse. The tune got major play on the airwaves for most of 2019 and introduced Swae Lee to a larger audience. It also showed Post Malone is a steady hit-maker.

7 Post Malone and Rich Brian

Rising hip-hop artist, Rich Brian, who, like Post Malone, rose to fame via the Internet, celebrated Post's birthday. He hired a mariachi band to sing for Post on his special day. Post reciprocated by hiring a Gospel choir to sing Brian's latest single, "Glow Like Dat".

6 Post Malone and Lil Peep

Lil Peep was known for his introspective, emo-rap music. He spoke with brutal honesty about his struggles with depression and substance abuse. He passed from an overdose in 2017 and his death became a wake-up call for Post Malone.

Post knew he needed to stop using prescription drugs recreationally...for good. He has defended the death of Lil Peep and asked people to stop judging the deceased artist.

5 Post Malone and Quavo

Post Malone's debut album, "Stoney", featured "Congratulations" with Migos rapper, Quavo. Upon its release, the single climbed up the charts, becoming his biggest and most international hit. The hit single brought visibility to both of the performers, whose careers were on the same trajectory at the time i.e. going up and up.

4 Post Malone and G-Eazy

Fellow hip-hop artist, G-Eazy, was featured on Post Malone's "Beerbongs & Bentleys" album, in the song, "Same Bitches", with rapper YG. It's a racy song about certain types of women in Los Angeles that lean on famous men for a living. As the two artists love to indulge in the nightlife, it's not a big surprise that they have come across some unsavory ladies who are looking for a payout.

3 Post Malone and Ozzy Osbourne

Post Malone and Ozzy Osbourne's collaboration on "Take What You Want", which also features rapper, Travis Scott, was one of the big cross-genre singles from the latest album, "Hollywood's Bleeding".

It was through Andrew Watt, Post Malone's co-writer and co-producer, that Ozzy Osbourne and Post Malone got together. Watt is a friend of Kelly Osbourne, who played the instrumentals for her dad. Ozzy loved it and signed on to feature on Post's track.

2 Post Malone and Brielle Biermann

Oh, how worlds collide. Post Malone's friendship circle even crosses over to reality star offspring. Brielle Bierrman, plus her mom, ex-Real Housewives of Atlanta star, Kim Zolciak, partied with Post before a concert in Atlanta. They all hung out and played beer pong.

1 Post Malone with Dua Lipa and Ella Mai

Post Malone is photographed here with Dua Lipa and Ella Mai, for Billboard's Grammy Preview cover shoot. The three rising artists talked about not being pigeonholed by any genre or style, and spoke out against stereotypes. They also share a love of British reality TV show, "Love Island".