At last night's premiere of We Own the Night, celebrities pondered the nature of sibling rivalry. In the film, Mark Wahlberg plays a cop whose brother (Joaquin Phoenix) ends up challenging him over a nightclub raid. We asked Wahlberg if he was still facing that kind of competition from his brother, Donny. "I’m still trying to kick my brother’s ass," he assured us. "That’s what it’s all about.” Which is funny, because we thought it was all about the fact that his brother's ass had been thoroughly kicked since Marky Mark outlasted the New Kids on the Block. Adam Goldberg feels the same way. "My [siblings] are 12 and like 13 and 10," he explained. "But I have it very severely because they get to wear little dresses and get a lot of attention.” Isn't that always the case? Speaking of dressing up and getting attention, when we ran into Rihanna at the after-party, we had to ask about her trademark hairdo and whether it was inspired by Victoria Beckham. "Is it Posh?" we asked. "My hair is Rihanna," she shot back. "Get used to that!" —Bennett MarcusRead more of our complete We Own the Night premiere coverage!