Last night Chris Brown was involved in a brawl with Frank Ocean.

According to TMZ Chris Brown was at Westlake Studio in the L.A. area listening to one of the artists he represents. The sources say as Chris went to leave, Frank Ocean and his crew blocked Chris from leaving. The sources say Frank said, "This is my studio, this is my parking spot."

According to sources, Chris went to shake Frank's hand ... and that's when one of Frank's people attacked Chris. Sources connected with Chris say one of Chris' friends jumped in front and hit Frank's friend.

Sources connected with Chris say Frank then came at Chris ... Chris pushed him away and they started brawling.

After the incident, Ocean tweeted "got jumped by chris and a couple guys. lol. i only wish everest [his dog] was there. cut my finger now I can't play w two hands at the grammys."