Drake's got a lot of enemies, which is probably why he has such a knack for bringing famous people with long-running feuds together under one roof.

Drizzy turns 30 today, and to celebrate, he hosted a party last night that may or may not have had a "Bad Blood" theme. Katy Perry, John Mayer and Taylor Swift, a trio with a twisted history, were all on the guest list, presumably because all Drake wanted for his special day was drama.

Fortunately, one brave man scored selfies with all parties involved.

Here's Katy Perry.

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Perry's ex, John Mayer, also posed for a selfie. Mayer and Perry allegedly spoke briefly at the event.

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And what do you know! Taylor Swift, another one of Mayer's pop star exes and enemy of Perry, was at the soiree. The Haim sisters and Karlie Kloss were her squad of the evening.

Swift and Mayer wrote the brutal kiss offs "Dear John" and "Paper Doll," respectively, about each other back in the day. And, well, "Bad Blood" happened.

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The whole thing is even juicier considering that Mayer is rumored to be dating another known Swift enemy, Demi Lovato.

Drake was also there, rocking a stunning velvet blazer and turtleneck combination along with some OVO bling.

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Rihanna did not attend, which seems to confirm that their on-again, off-again love story has fizzled once more.

Drake's parents, who split a long time ago, were friendly at the party as Dennis Graham, the next big thing in R&B, took the lead singing "Happy Birthday." (Sorry, Taylor.)

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The boy himself gave a speech commemorating the passage of time. "Look at this number, there's a different digit up front," he said, motioning to the big 3-0 on top of his cake.