While you probably know Duff for starring on Disney's "Lizzie McGuire" and her teen pop career, you aren't alone if you've never heard of Koma.
We're so happy for them! She now has her son, Luca, 6, with her ex-husband, Mike Comrie, who she married back in 2010.More news: Trump celebrates birthday during lunch with Singapore PM Lee
Hilary rekindled her relationship with singer Matthew in December after splitting in March last year, having previously stated how "timing is such a big deal" to relationships. The baby will also have a playmate in Hilary's new niece Lulu, who was born to her sister Haylie on Thursday.
In an interview with E!
She warned, "Besides, watch, I'll probably get some evil spawn of Hilary the next time around". He's the best.' I'm like, 'I'm here. "You're always on my side!' She's such a traitor".More news: Kingdom Hearts 3 release date announced
Hilary agrees with her parent that she has a keeper in Matthew.
The 30-year-old actress opened up about their romance in December, saying the third time around is going "great". Duff captioned the photo of her and music producer Koma, 31, showing off a growing baby bump. "I mean, this is like the third time that we've dated".More news: Fans wonder whether LeBron's injured hand cost the Cavs a championship