Hilary Duff Luca son playdate Beverly Hills

Another day, another awesome outfit for Hilary Duff ... and another sighting of her oh so adorable son Luca!

On Wednesday the former Disney star went to a mommy and me class near her home, and we can't believe how big her little boy is getting! Hil on the other hand has gotten a bit smaller in recent weeks, but her toned figure looks fabulous in these skintight jeans.

In other, sadder news, Hil lost her chihuahua Lola yesterday. "Thank you for all your well wishes for my beautiful Lola .. it really means so much when you a hurting to know so many people care. <3 U all," she tweeted, later adding, "RIP my beautiful Lola girl <3 my heart is broken:( Say a prayer for my little angel." Aww, poor girl! Our heart goes our to Hilary...