The Younger actress, 30, has given birth to a baby girl named Banks Violet Bair. This is her first child with boyfriend Matthew Koma, 31.
Duff took to Instagram to share the exciting news, as well as the first photo of her daughter.
"Banks Violet Bair❤️ this little bit has fully stolen our hearts! She joined our world at home on Thursday afternoon and is absolute magic ✨," she wrote.
Proud dad Koma also shared the birth announcement, writing, “Banks Violet Bair /// 10.25.18 /// We welcome a beautiful daughter, little sister, and best friend for life. Could not possibly be more grateful for our growing family and for the 🍊 who makes it all possible. Cloud ten.”
Duff revealed in June that she and Koma were expecting after getting back together together late last year after splitting briefly in March 2017.
Duff is also mum to son Luca Cruz, 6, with ex-husband Mike Comrie.