On March 20, 2012, Duff welcomed her first child, a son named Luca, with her then-husband Mike Comrie. Although the pair split in 2016, Duff says she wouldn't choose anyone else to coparent her son with. We always love seeing new photos of Luca, especially since he's become a doting big brother.
On Luca's eighth birthday in 2020, Koma shared a bunch of snaps of the two of them together alongside an adorable caption on Instagram, writing, "It's this little dude's 8th birthday today and I couldn't be more proud + honored to watch him become the little man, son, brother and role model he is. Some of the perspective this kid brings into our world is actually mind blowing. We have each other's backs so hard and I've learned more from him than he'll ever realize. Thank you Luca, for letting me walk you into school, for walking me down the aisle, reigniting the kid in me, singing my songs with me, looking out for my dairy allergy, teaching me every good iPad game, watching 'Frozen' with your sister every morning, letting mom think you break things when I really do, and for just simply being you. We'll always, always be the 'sweet team'. Can't wait for you to read this in 15 years when you're allowed to have an Instagram."