updated 04/02/2012 AT 2:00 PM ET
•originally published 04/02/2012 AT 11:15 AM ET
Duff went with a sporty look with her outfit Sunday, perhaps not surprising, given that she’s already hitting the gym post-baby.
“20 minutes on the elliptical seems like an eternity!!!” she Tweeted on Saturday.
On Monday afternoon, Duff shared our first glimpse at her baby boy, Tweeting a photo of his toes.
“My favorite little feet,” she writes.