Natalie Portman, who is currently starring in the movie V for Vendetta, was recently the host of Saturday Night Live. The following rap video was first aired during that appearance. SNL has had some recent success with these digital shorts since they employed Andy Samberg. Samberg had made a few videos as part of a group called The Lonely Island. I believe SNL found him by virtue of a pilot they had pitched to Fox. His digital short with Chris Parnell, Lazy Sunday - The Chronicles of Narnia Rap, was an instant hit and the internet was immediately deluged by the video. Within a short period of time, NBC forced You Tube to pull the video but it can still be viewed here. Samberg appears in the Portman rap as well.
I've been a huge Natalie Portman fan since she appeared with Zack Braff of Scrubs in his movie Garden State. If you haven't seen the movie, I highly recommend it. The rap video is a big departure from the character she played in Garden State but she seemingly pulls it off with ease.