The above image of singer Rihanna pummeling Chris Brown’s girlfriend Karrueche Tran is Photoshopped, but Rihanna continues to play cat-and-mouse games with Brown’s main squeeze.

When Rihanna tweeted birthday greetings to Brown on Saturday, Karrueche quickly followed up with her own tweet. But Rihanna beat her to the punch, so to speak, by wishing a happy birthday to the troubled singer who beat her so badly in 2009 that she was spitting up blood.

You have to feel sorry for Karrueche. She’s waging a losing public battle against a superstar who is determined to win her man back.

Brown turned 23 on Saturday as he celebrated with Tran and friends in Los Angeles. Meanwhile, on the east coast, Rihanna was the musical guest on NBC’s “Saturday Night Live” in NYC. While she lip synced her opening number “Where Have You Been,” Rihanna surprised the audience by singing her hits “Birthday Cake” and “Talk That Talk” live!