Staying in shape so she can keep up with her little boy, Hilary Duff went to the gym in Los Angeles on Tuesday morning (December 10).

The "Lizzie McGuire" star wore a gray sweatshirt and black cropped leggings as she made her way inside.

Recently, the 27-year-old working mom has been preparing for a return to the music biz, recording new tracks in the studio.

On Monday, Hilary shared with fans on Twitter, "It's meeee and @iek having fun recording 'outlaw' tooooday this one has a contagious 'bounce' I'm excited :)."