After reading an interview article on Carly Rae Jepsen (CRJ) in The Star today, I started searching for these:
Justin Bieber, Selena Gomez, Ashley Tisdale, Carlos from Big Time Rush & friends danced to the song
Katy Perry's version However, I can't manage to find James Franco's lip-dub.
In the interview, CRJ mentioned that she doesn't even dare to give her number to some random guys she just met. Basically, it is just a song.
Anyway, I like Bieber's than Katy's. :D