Reports say that Chris Brown's ex got "angry" at a recent party when the DJ play Rihanna's "Birthday Cake" remix featuring Chris. According to Hollywood Life, Karrueche was partying at Playhouse nightclub in L.A. and a source said "Karrueche looked angry when the DJ played "Birthday Cake"This is actually the same night that RiRi showed up to the same club -- knowing that Karruche would be there.

The source continued, "Rihanna threw a little shade and didn't give a f**k who was going to be there. She club hopped last night and yea, she knew the other bi**h was suppose to be at Playhouse but she didn't care and she wanted to shut the club down and that's just what she did," our insider told us. "There wasn't any run-ins or nothing like that but she just wanted to show up and get her party on and have a good time."

Seesh this love triangle is getting too messy!!