The first time Booboo met Robert Pattinson was the Teen Choice Awards last week. He said Rob was cool and came up to him and said "Hi I'm Rob we haven't met yet.
BooBoo made those comments while attending TwiTour in New Jersey today. He also said Edward was his favorite Cullen. Spoken like a true Seth! - Of course he'll get to work with Rob (in human form) for Breaking Dawn. Thanks to @Twilight Lexicon for tweeting the details of the Q&A.