The Glee star wed actor Ryan Dorsey just three months after breaking off her engagement to rapper Big Sean. Less than two weeks before her wedding, Rivera was demoted from a regular to recurring status. And then there's the never-ending rumors about her feuds with co-stars Lea Michele and Mark Salling.
Rivera's unpredictably is reminiscent of Doherty, whose off-screen antics often overshadowed her work on Beverly Hills, 90210 in the early '90s. Here, E! News compares the 27-year-old and 43-year-old stars.