Hilary Duff has welcomed four children with Mike Comrie and Matthew Koma over the years. The actress became a mom in March 2012 when she gave birth to her and then-husband Comrie’s son, Luca.

here is a complete timeline of Hilary Duff and Matthew Koma's relationship. The future couple met while working on Duff's Breathe In. Breathe Out. album, which was released in June 2015.

It might be time for Hilary Duff to ... her 2002 Christmas album, Santa Claus Lane, with her four kids — which she hasn't done yet. "You know what, I need to," Duff tells PEOPLE.