Justin Bieber Dodges Dress Code for Oscars After-Party (PHOTO)

Justin Bieber passed on a tux, a suit and tie or even a blazer for an Oscar after-party he attended ... opting instead for Old Navy.

Paps got the Biebs Sunday night outside of the Vanity Fair Oscar party in Bev Hills, and he looked ... well, about as dressed up as you'd expect.