Celebrity Porn Star Look-Alikes

If these celebrities' careers tank, they at least have a back up in porn!

From Fox 411: "There are some striking similarities between several adult film stars and some of Hollywood's biggest names." Kristin Cavallari, for example ... "'The Hills' starlet and 70s adult actress [Marilyn Chambers] look just alike. Sadly, Marilyn passed away last year at the age of 56."