Chris Brown Kisses Nicole Scherzinger?

Chris Brown and Nicole Scherzinger have sparked cheating rumors after a sexy night out partying.

Brown 23, and the former Pussycat Doll, 34, had a night out Sept. 25 at the Hollywood hotspot -- where a camera caught them dancing and kissing on the lips.

According to US, Brown's current girlfriend Karrueche Tran will be furious. Tran was upset when Brown and Rihanna, 24, kissed on the lips in the audience at the VMAs in L.A. Sept. 6.

Tran was "totally pissed off," a source told Us of that PDA between Brown and Rihanna, whom he assaulted in February 2009. "She felt the kiss was a public slap in the face
Gin3r