Chris Brown's current girlfriend Karrueche Tran was denied entrance to the Pink Elephant in NYC, because Rihanna was already inside. A rep for Karrueche revealed "she was told she could [not] attend said club, because Rihanna was inside. [She] decided to go elsewhere."

A spokesperson for the club also explained the situation from their point of view, saying "She wasn't let in as a courtesy to Rihanna. To keep the peace, they decided it was in everybody's best interest if they weren't on the dance floor at the same time."

Source: pagesix.com