Heather Graham & Zach Galifianakis: 'The Hangover Part III' Premiere!

Heather Graham is stunning while attending the premiere of her latest flick The Hangover Part III on Monday (May 20) in Westwood, Calif.

The 43-year-old actress was joined on the red carpet by her co-stars Ed Helms, Zach Galifianakis, Justin Bartha, Ken Jeong, and director Todd Phillips.

PHOTOS: Check out the latest pics of Heather Graham

“Gwen Stefani. I love watching what she wears. She’s adventurous and looks like she’s having fun,” Heather recently shared about whose style she admires.

FYI: Heather is wearing an Herve L Leroux gown. Justin is wearing an Etro suit.

15+ pictures inside of Heather Graham and Zach Galifianakis attending the premiere of The Hangover Part III…