Hilary Duff  baby pink Molly Sims sunglasses

She's back!

After unveiling her fabulous post-baby body while vacationing in Mexico with friends earlier in the week, Molly Sims turned up her maternal instincts in L.A. on Thursday when she and her son Brooks were out and about.

The former Sports Illustrated model was pretty casual as she went without make-up while running some light errands with her adorable baby boy before meeting up with fellow celeb mommy Hilary Duff and her son Luca for a kiddie play date.

How cute is that?!