A dispute over music rights ended in a physical altercation between Drake and Sean "Diddy" Combs."

The two rappers both attended a birthday party for DJ Khaled in Miami on Sunday night. The fight started outside the night club Liv at the Fontainebleau Hotel following an argument about "music rights to an unknown song," according to Page Six.

"Drake and Diddy got into it outside the club. They were arguing over the rights to a song, and got into a physical fight. Diddy claimed that Drake was using music without the proper rights," a source told Page Six.

After the fight was broken up, Drake left the scene and Diddy went into the club.

Comedian Lil Duval tweeted early Monday morning that the fight had started because Drake said "hello" to Diddy's girlfriend Cassie, but he immediately followed up the tweet by writing, "I just made that s*** up." Rick Ross' DJ, Sam Sneaker, also denied the Cassie rumor.

It definitely wasn't bout Cassie.