The "Pitch Perfect" beauty looked absolutely stunning in a two piece black and floral ensemble featuring her toned tummy as she headed down the red carpet.
Luke is in the midst of marriage talks with his girlfriend of six years, Kate is playing it cool with her music producer boyfriend Chris. But you know what makes the line between 'friends' and 'more than friends' really blurry? Beer."
Starring alongside Anna are Olivia Wilde, Jake Johnson and Ron Livingston.