James Franco and Natalie Portman are joining twelve other actors for an artsy video collection called Fourteen Actors Acting ... depicting classic screen types.

The oh-so-sexy Mr. Franco, with a mustache, manages to seduce himself in a mirror ... ending in a solo french kiss. Ooh la la!

As for the Black Swan actress, she is stripping down to her skivvies ... all for the craft.

Other actors joining the silent fun ... Michael Douglas, Javier Bardem, Matt Damon and Social Network's hottie, Jesse Eisenberg.

And ... scene.