Beyonce gets nasty

Beyonce Knowles had to get so mean and moody for her role in new movie Dreamgirls that it affected her relationships with her friends, family and boyfriend Shawn 'Jay-Z' Carter.

The singer-turned-actress took a method approach to prepare for the part of starlet Deena, her first character movie, after brief parts in Austin Powers: Goldmember and The Pink Panther.