Josh Hartnett & Casey Affleck - Vanity Fair Oscars Party 2013

Josh Hartnett suits up for the 2013 Vanity Fair Oscar Party held at Sunset Tower on Sunday (February 24) in West Hollywood, Calif.

The 34-year-old actor looked dapper in a Dior Homme black wool and silk classic tuxedo, white cotton wing collar button down shirt, black satin bow tie, and black leather derbies.

Casey Affleck and his wife Summer Phoenix were also spotted attending the party.

Earlier in the evening, Casey‘s big brother Ben Affleck picked up his second Oscar, this time for Best Picture for his work on Argo!

FYI: Summer is wearing Guishem.