Oscar Stars' Most Embarrassing Roles
Meryl Streep, Mamma Mia! (2008)
Nobody does it quite like Meryl Streep. The iconic movie actress, who is revered as one of the greatest living film actresses, has tackled a whole slew of award-worthy roles, including her Best Actress win for her portrayal of Margaret Thatcher in 2011's The Iron Lady. Just three years prior, however, Streep let her hair down to head up the cast of Mamma Mia!, singing ABBA hits like it was nobody's business.