Katy Perry, Taylor Swift and John Mayer Were All at Drake’s Birthday Party

It’s a small world after all — well, at least in Hollywood.

Taylor Swift and Katy Perry were in attendance at the 30th birthday celebration for Drake in Los Angeles on Sunday night, as well as their shared ex, John Mayer, a source tells PEOPLE.

Swift arrived early to the birthday bash — which brought together 150 of the rapper’s closest family and friends at the h.wood group’s Delilah — and had several girlfriends in tow, including model Karlie Kloss and the Haim sisters.

Katy...

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