Justin dissed Rob!

Who knew Justin Bieber and Rob Pattinson hung out together? They do! Both guys were hanging with Katy Perry at the premiere of her movie, Katy Perry: Part of Me 3D. After the movie, Justin invited everyone to ride in his party van. But just before Rob could jump in the van, the doors closed in his face! Justin realized what happened and quickly opened the doors to let Rob in. Don't worry, this diss was a total accident!