Mamie & Grace Gummer - Vanity Fair Oscar Party

Mamie and Grace Gummer step out together for the 2012 Vanity Fair Oscar Party held at Sunset Tower on Sunday (February 26) in West Hollywood, Calif.

The daughters of Meryl Streep, 28 and 25, watched as their mom took home the Academy Award for Best Actress for her work on The Iron Lady! Meryl has been nominated 17 times and won three times.

The New York Daily News spotted Mamie and Grace hanging out with their younger sister, Louisa, and their parents at a VIP lounge while mingling at a pre-Oscar bash earlier in the weekend.