Oscar Stars' Most Embarrassing Roles
Meryl Streep - Mamma Mia!
Meryl Streep - Mamma Mia! (2008)
The ABBA-inspired Mamma Mia! might be the highest grossing musical movie of all time but even the world's greatest living actress can't make it any less cringe-worthy when she starts belting out "Dancing Queen" wearing a pair of overalls and a feather boa.