VIDEO: Which Taylor is Not So Swift?

Perhaps the cunning grace of playing werewolf Jacob Black didn't rub off on Taylor Lautner?

The young star of New Moon was on set today filming Valentine's Day, a new rom-com where he plays a track star, and RadarOnline.com has a video of him completely wiping out!

Taylor quickly recovered on the set of Garry Marshall's ensemble, then focused on filming scenes with fellow teen sensation Taylor Swift.

Looking like a cute new couple, the Taylors spent the day out in the field. 

The songstress looked lovely in a bright blue dress, and Lautner buff in his gym gear. 

If these two were dating off-set, what would their nickname be?  T2? T Squared? Tell us in comments!