From Robert Pattinson Life:
1st video – Fan event in London. Rob’s parts at 2:25 and 4:31.
http://www.youtube.com/v/B75I4jH_3Nc&hl=en_US&fs=1&color1=0x2b405b&color2=0x6b8ab6&border=1
2nd video – New Moon Premiere. Rob’s part starts at 2:04 – Not new.