katytaylorjohngraziaqImage: Getty Images

Taylor Swift, Katy Perry and John Mayer must all love Drake, because they left their differences at the door to celebrate the rapper’s 30th birthday together.

Famous enemies Taylor and Katy, and John, who they have both dated, all mingled at small West Hollywood nightspot Delilah on Sunday night. While none of them posed together, they did all pose with Instagram user @youngbeardo, which is close enough.

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Image: @youngbeardo

It’s not known if Taylor and Katy agreed to call a truce while waiting in the queue for the bathroom, but according to Us Weekly Katy and John, who were together on and off for about three years until they ended their relationship in July 2015, were seen talking although “the conversation wasn’t for long”.

If you need a refresher, Taylor and John dated in 2010 and after they broke up, she wrote the song Dear John about him and featured it on her album Speak Now. He later told Rolling Stone he was “humiliated” by it and that he “didn’t deserve it”.

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Image: @youngbeardo “I’m pretty good at taking accountability now, and I never did anything to deserve that. It was a really lousy thing for her to do.”

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Image: @youngbeardo

Katy and John then began dating in 2012, and it was also around this time that some backup dancers on Taylor’s tour left to join Katy, which apparently upset Swift so much she decided the two were sworn enemies, and it’s the industry’s worst-kept secret that Taylor’s Bad Blood song and video are about Katy.

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Image: Drake via Instagram

Then of course, in the fallout from Taylor’s split from Calvin Harris this year, he tweeted that Taylor had tried to “bury” Katy, and the Rise singer seemed to say I told you so by tweeting a Hillary Clinton meme.

Last month Katy tweeted in response to a fan that she would collaborate with Taylor “if she says sorry”. Could they have made up at Drake’s bash? TBC.