The 'Turn Up The Music' singer's partner Karrueche Tran witnessed the display of affection along with a television audience at the Staples Center here.
Apparently the 23-year-old aspiring model is upset with her boyfriend of almost one year for allowing the peck after winning Video of the Year at the annual gathering, reported Us magazine.
"She felt the kiss was a public slap in the face," a source said.
Rihanna, 24, and Brown parted ways in February 2009 after he brutally assaulted her and have more recently been rumoured to have rekindled their romance.
"Karrueche and Rihanna really hate one another and Chris ultimately just does what he wants. Seeing him with Rihanna at such a public event made her very angry," the source added.
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