Weeks after Chris Brown raised eyebrows in a very public liplock with ex Rihanna at the MTV Video Music Awards, the singer hit L.A.'ss Supperclub with another famous, pretty singer: Nicole Scherzinger.

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The "Don't Wake Me Up" crooner, 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.

The latest snapshots probably won't go over well with Brown's current girlfriend Karrueche Tran. Dating the R&B star for nearly a year, the aspiring model, 23, was incensed when Brown and Rihanna, 24, kissed on the lips in the audience at the VMAs in L.A. Sept. 6.

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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."

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"Don't Cha" singer Scherzinger, meanwhile, may also have some explaining to do: Despite a brief split in 2011, she and hunky British race car driver Lewis Hamilton, 27, have reportedly been back on for much of 2012.

This article originally appeared on Chris Brown Kisses Nicole Scherzinger on Sexy Night Out