The "I'm fucking...(Insert Celebrity)" Meme?

I'm fascinated by these videos, but especially by the fact that the last one was filmed on the set of a Kevin Smith flick with Elizabeth Banks singing "I'm Fucking Seth Rogen." I think it would be really great if this became a meme - different stars and famous people making "I'm fucking..." videos.
It's pretty genius because it mocks the whole tabloid TMZesque papers and sites by shoving it right in their faces. Are these videos serious or is it just another "act"?

I'm fucking Matt Damon:



I'm fucking Ben Affleck:



I'm fucking Seth Rogen:
Sorry, the video is not embeddable...