Tupac had some pornstars in the video for "How Do You Want It" back in the mid-1990s. Can't remember which ones though. Heather Hunter may have been one.
Tawny Kitaen isn't a porn star but there was a version of the video "Here I come Again" where there was a nice bush shot on the hood of the Jaguar. MTV edited it for the second day!
Peter North is in Hollywood Undead's video for "Been to Hell." the blonde chick in the video is also a porn star, but I can't think of her name offhand.
I've looked online but never see it mentioned, so I could be wrong. I thought Alexis Texas was in the video for LMFAO's "Sexy and I know it," but when I paused it (at 1:14 of the video), the girl has a necklace on with a different name. Sure looks familiar though!
There are a gazillion girls in that video. I do not know about the "lead"girl, but India, who had a bit of a music career, is in it (wearing a red bra), and there is a girl in sunglasses who looks like Lacey Duvalle. Probably others as well.