Hurrah! Beverly Hills, 90210 star Shannen Doherty is joining the cast of Fox's nighttime sudser, North Shore. She'll play Alexandra Hudson, the bitchy long-lost sister of Nicole (Brooke Burns). According to The Hollywood Reporter, Doherty's signed on for a three-episode arc, with an option to become a series regular. Perhaps they're hoping the former Charmed sorceress will cast a Locklearian spell on North Shore's less-than-impressive ratings? "The comparison to Heather has been brought up to me," Doherty said. "It's great. I'm lucky because I have a really loyal fan base, and I hope they come over."