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Drake did it big for his 30th birthday.

The rapper hosted a party at Delilah Los Angeles, and many A-listers turned out for the swanky soiree. But there are three guests in particular who might cause heads to turn: Katy Perry, Taylor Swift and John Mayer. Need a reminder as to why this is making our jaws drop? Here you go:

Perry and T. Swift have been in an alleged feud for a couple of years now since Perry allegedly tried to "sabotage" the "Style" songstress' tour by taking some of her backup dancers. Both pop stars have taken jabs each other on social media and in interviews, so we have to wonder if anything was said while celebrating Drake's birthday.

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As for the Mayer tie in—both Perry and Swift have dated the "Gravity" crooner. Swift famously penned the song "Dear John" about him, which he later admitted caught him by surprise and "humiliated" him.

"I never got an e-mail. I never got a phone call," Mayer told Rolling Stone. "I was really caught off-guard, and it really humiliated me at a time when I'd already been dressed down. I mean, how would you feel if, at the lowest you've ever been, someone kicked you even lower?" 

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Perry and Mayer were on-again, off-again for a long time, but she has been dating Orlando Bloom for almost a year. A source tells E! News that Perry and Mayer "spoke throughout the night" very "peacefully." Mayer and Swift, on the other hand, "didn't cross paths" despite the fact that the party was an "intimate, mellow evening." Other guests included French MontanaJamie FoxxShay Mitchell and more. Guests sipped on Drake's whiskey Virginia Black throughout the night.

"It was a very intimate party with just friends and family. Started around 9 p.m. and went until after 3 a.m. Drake came in just before 10 and was with a group of guy friends. When he came in he had a big smile and was really happy. He said hi to everyone and gave everyone hugs," another source tells E! News. "People yelled, 'The birthday boy is here."

The insider added, "Taylor arrived with some friends and looked to be having fun. After dinner there was lots of dancing. At one point Drake and Taylor were seen near the DJ together talking, his arm over her shoulder for a minute like a real friend moment. It looked like they were talking about something deep."

After everyone sang happy birthday to Drake, "he thanked everyone for coming, gave a personal speech about thanking people who have been with him since the beginning and how much love he has for all his close friends and family who have supported him." 

David Blaine put on a magic show after dinner, which consisted of a Carbone menu, E! News has learned.

Drake received a "few gifts" from attendees but didn't open them during the party; however, the Canadian rapper gave his fans a gift in the form of new music. He announced a new project titled More Life, which will be released in December, and also released three new singles to hold over fans until winter.