Fergie sunglasses work out jog trainer bun grace jones

No wonder Fergie stays in such amazing shape. The Black Eyed Peas singer hit the streets of Brentwood for an afternoon run.

We love Ferg's casual style ... Grace Jones T-shirt, plaid shirt around her waist and her hair in a bun. This girl is focused on her fitness.

With a sexy hubby like Josh Duhamel waiting at home, girlfriend better keep her ladylumps in check!