3. Renée Zellweger as Bridget Jones in “Bridget Jones’s Diary”
People were up in arms when it was announced that Zellweger, a Texas native, would play Bridget Jones in the 2001 British romantic comedy based on the 1996 novel of the same name. But Zellweger quickly proved she was up for the challenge—training with an accent coach, working at Picador as a trainee, and gaining over 20 lbs. for the role. She even earned an Oscar nom for best actress in 2002.