"You're my best friend," she wrote over one image of Koma, before calling him the "best daddy" in another. Duff and Koma, who met in 2013 while working on Duff's Breathe In. Breathe Out.

Duff opens up to PEOPLE about her celeb-filled friend group of moms — which includes Meghan Trainor, Ashley Tisdale and Mandy Moore Hilary Duff is thankful for her tight-knit group of friends.

Both actors are now mothers and great friends. Believe it or not, Hilary Duff “bombed” her first audition for Lizzie McGuire. “But it was so cute and charming that it was like, OK ...

Because Duff gets real on Instagram and social media in general, she recently got candid about her need to go out with her fellow mom friends — and how doing so improves her mental health.

Hilary Duff is celebrating her oldest on his big day. The How I Met Your Father actress, 35, celebrated as son Luca Cruz turned 11, treating him and his friends to a day at Disneyland, as she ...

Hilary Duff is being a good friend to Mandy Moore, one of the many celebrities forced to leave home as scary wildfires rip through Los Angeles. Musician Griffin Goldsmith, the brother and Dawes ...

Hilary Duff is thankful for her tight-knit group of friends. The singer and actress, 37, who's currently partnering with Meta to promote the company's AI software, is opening up about what it's ...