Discovered in Canada at a Canadian Football League game, Pam made her Playboy debut in 1989 and then head off to Hollywood. She then made the best two career moves in Sex Symbol history - she died her hair blond and got a breast job. That led directly to her landing the job responsible for her being the Sex Symbol of the 90's - CJ Parker of Baywatch. It's rumoved that Tivo included their slow motion feature simply to watch Baywatch.
Pam's most famous movie role was as herself, in her widely seen video (in 15 minute intervals) of her having sex with Tommy Lee. The movie, which takes place on a oat in Lake Havasu (or so I've heard) is the most watched pornographic video in history.