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Duff shares Luca with ex-husband Mike Comrie. Their divorce was finalized in 2016.

She and current husband Matthew Koma, who wed in 2019, welcomed daughter Banks in 2018 and are anxiously awaiting their second child together.

Koma also shared a photo with Luca to celebrate his birthday.

View this post on Instagram

A post shared by Matthew Koma (@matthewkoma)

\"It’s my little dude’s 9th birthday tomorrow and he asked me to put Green Day on in the car last week. Old Green Day. Makes me tear up,\" he captioned the post.

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