Once upon a time, porn stars aspired to cross over to the mainstream. Now, Hollywood actresses aspire to become porn stars. Actress, model, and single-handed supporter of the Lucite stripper shoe industry Shauna Sand is the latest Tinseltown pseudo-star with a sex tape. Vivid Video, the adult movie industry’s leading production company and the force that brought the world the Kim Kardashian sex tape, says it’s preparing to release “Shauna Sand Exposed” on Oct. 19. Meanwhile, Sand is protesting to anyone who will listen that, yes, she made an X-rated home video with her boyfriend, but “I certainly didn’t sign off on this and Vivid has no right to put it out.” Sand is no shrinking violet. She’s appeared in Playboy sans clothes already. But is this really a “homemade sex tape”? Judging by the trailer, the lighting, the angles, and the fact that Sand keeps looking at the damn camera, it looks like this video was made for the sole purpose of selling it. The release is timed to coincide with the debut of “Leave It to Lamas,” which costars Lorenzo Lamas, Sand’s ex-husband. In Hollywood, the best revenge turns a profit.