Hilary Duff Beverly Hills son

Hilary Duff was all smiles as she carried little Luca and an oversized stuffed animal to a pal's baby shower in Beverly Hills, on Sunday afternoon.

The Lizzie McGuire star has been working overtime to shed the post baby weight, and it's definitely paying off because the 24-year-old is looking slimmer by the day!

Duff gave birth to her darling son in March, and the proud new mom took to Twitter on Saturday to share a Twitpic of her little guy at four months old, exclaiming: "Little turkey is four months old today! Hard to believe! Times flying."