Hilary Duff has the glow! The pregnant former Disney star showed off her baby bump at a party in Malibu Sunday, as she held her son Luca's hand and was escorted by her musician boyfriend Matthew Koma.

The trio carried pink balloons and a gift to the event -- and in fact the pink is appropriate because the actress just announced she and Koma are expecting a girl. Hilary's older sister Hayley just gave birth to a daughter six days ago so it's babies all around!

Hilary and boyfriend Koma announced their impending bundle of joy on Friday with this pic, captioned: "@matthewkoma and I made a little princess of our own and we couldn't be more excited!!!!!" Congrats!!!