Rihanna and Katy Perry were two of the closest friends in Hollywood in the early 2010s, having quickly formed a bond over their love for purses at a glitzy industry event. In fact, they were so close that Rihanna even organized Katy's bachelorette party when she was gearing up to marry her then-husband, Russell Brand. Through thick and thin, at several concert shows, getaway trips with their friends, and even sitting at award ceremonies together, Rihanna and Katy were extremely close friends.

But as Nelly Furtado once put it, all good things come to an end, and while it's unclear as to what exactly caused the rift between Katy and Rihanna, by 2018, the former besties were definitely not on speaking terms anymore. Reports claimed that they hadn't been cool for a while, and when Rihanna hosted the Met Gala two years ago, not only did she take a very awkward photo with Katy, she also allegedly snubbed her from the afterparty.

Here's a look at some of the most memorable moments of Rihanna's friendship with Katy, who is currently expecting her firstborn with Orlando Bloom.

12 They Bonded Over A Purse In 2009

Rihanna and Katy Perry quickly formed a friendship over a Valentino purse that the ‘Roar’ singer couldn’t keep her eyes off. After being swarmed with compliments over the accessory, Rihanna decided she was going to send Katy the same exact purse as a gift, and the rest was history.

11 A Friendship Quickly Developed

In an interview with Elle, Rihanna went on to gush about her friendship with Katy, telling the publication that it was rare to find genuine pals in the industry. She gushed: "I'll tell you, you do not find people like her in this industry. She's gorgeous, charming, and so unedited it's scary. That's what intrigued me most when I first met her: She said it like she saw it. I trust people like that."

10 They Supported Each Other On The Road

By 2010, the pop stars had become so close that whenever one of them had some free time on their hands while the other was on tour, it wasn’t uncommon to see Katy Perry show up to a Rihanna concert, and vice versa. Fans clearly loved the genuine bond they shared for one another since it’s not every day when two of the biggest singers become the best of friends.

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9 They Always Sat Together At Awards Shows

When award season came about, there was nobody else that Rihanna wanted to sit next to than her bestie, Katy Perry. From the Video Music Awards to the Grammys, whenever the cameramen got a shot of either one of them, they always appeared to be in good spirits while seated next t to one another. Those days are clearly gone.

8 Katy Considered Rihanna A Close Friend

In an interview with Elle UK, Katy Perry told the magazine in 2013 that there was a lot of darkness in the entertainment industry, but she noted that one thing that always brought light to her day was the closeness she shared with Rihanna. "I love her and every time I see her, I'm reminded of the light that she has," Katy said. "There's a lot of dark in this business."

7 Rihanna Was Gutted To Miss Katy’s Wedding

When Katy Perry married British comedian Russell Brand in a lavish Indian wedding ceremony, it just so happened that Rihanna couldn’t attend her friend’s big day due to the commitments she faced with the release of her album, LOUD.

"The album is coming out in two weeks, and I had to be available for a lot of approvals [and check] e-mails and stuff. We couldn't get any phone service or Internet service out there. It was scary.” Katy wasn’t mad about the situation, according to the Bajan beauty. “She understood, and I was glad that I could at least throw her her bachelorette party and be involved somehow."

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6 But She Attended Her Bachelorette Party

Not only did Rihanna attend Katy Perry’s bachelorette party in Las Vegas, she organized the entire event, showing fans just how close these two were when they were still the best of friends. The party started at the Hard Rock Hotel Beach Club and later moved to the MGM Grand Hotel/Casino with dozens of friends in two.

5 Katy Had Discussed A Potential Collaboration

Katy Perry revealed in an interview with Capital FM that she would certainly be open to the idea of doing a collaborating with Rihanna somewhere down the line, but she didn’t want it to feel forced. If anything, the opportunity should come along naturally for the right song. "But the thing is we're not just going to cash in on that idea unless it's bulletproof, because you really only get one shot at that,” she insisted.

4 Rihanna Threw Shade Over Katy’s ‘American Idol’ Gig

In 2017, just months after it was revealed Katy Perry had joined ‘American Idol’ for $25 million, Rihanna was asked if she would be interested in judging a talent show somewhere down the line. “Oh, I don’t know. Depends on how bored I am,’ she responded, which many deemed as subliminal shade at Katy, who RiRi already wasn’t cool with anymore at that point. Taking that into consideration, we doubt she congratulated Katy on her pregnancy.

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3 They Took An Awkward Photo At The Mat Gala

In May 2018, Katy Perry and Rihanna had made their first appearance together in years, as they both attended the Met Gala in New York City. As co-chair of the annual event, Rihanna had to pose with a bunch of celebrities upon their arrival, including Katy, but it’s evidently clear that the ‘Umbrella’ hitmaker was uncomfortable around her former pal.

2 Rihanna Didn’t Invite Her To The After Party

To make matters worse, Rihanna, who was also hosting the Met Gala afterparty, reportedly didn’t extend an invitation to Katy Perry, who was therefore not included for the festive star-studded occasion after the main event had concluded. It was never explained why Rihanna opted no to have Katy at the party, especially since they had just posed for a photo hours earlier. It confirmed that there was definitely tension between the two.

1 Is Orlando Bloom To Blame For Their Feud?

Mixed reports have claimed that their friendship ended because they simply haven't been in contact with each other as much as they used to, while others believe Katy’s fiancé, Orlando Bloom, may have had something to do with it.

One source explained: “Some pals have said they just grew apart when she started dating Orlando Bloom last year but the reality is, nobody knows exactly what went down between the pair.”

NEXT: The Rumored Orlando Bloom And Justin Bieber Feud: Explained