Robert Pattinson and Justin Bieber partied in Hollywood together

Robert Pattinson joined Justin Bieber and his girlfriend, singer/actress Selena Gomez, for a night of partying in Hollywood.

Pattinson joined Bieber and Gomez at the Marmont on Tuesday night for a night of partying. Katy Perry was also partying with Pattinson, Bieber and Gomez. According to US Magazine, when the group was finished partying at the Marmont they ended up getting into Bieber's limousine bus. They then traveled together to David Arquette's club opening. According to TMZ, at first it looked as if Pattinson was not going to be allowed into the bus when the stars left Marmont. However, the Twilight star was eventually let into the limo bus. According to Metro, earlier in the night the group was celebrating the premiere of Perry's new movie called Part Of Me. Before the group went out partying, Bieber and Gomez joined Pattinson for dinner. A source says that it wasn't just the four of them partying at the club but they were all close to one another.