Duff and Koma, a record producer and songwriter, were first linked in January 2017, and dated on and off before getting serious.
"I mean, this is the third time that we've dated," the former Disney star said during her appearance on The Talk in December 2017. "Timing is such a big deal! I think that you have history and a past with someone and love, and just because it doesn't work out the first time, the second time, as long as there’s not too much damage done, then, it can always work out again."
"I'm really happy, he's amazing, and I mean, honestly, we don't really want to leave the house that much these days," she admitted. "We just stare at our baby and we're like, 'Look what we made. We did this.' And he's such an amazing dad and so supportive and I just feel very happy."