Los Angeles
In an Instagram post on Saturday, the ''Younger'' star revealed that the baby was born earlier this week on March 24.
The 33-year-old also said they have named their daughter Mae.
''Mae James Bair - We LOVE you beauty 3-24-21,'' Duff wrote alongside a photograph of the baby, alongside Koma, their elder daughter Banks (two) and Duff's son Luca.
The former Disney star announced the birth of the newborn on Friday on social media without giving out many details.
During quarantine, while Duff was pregnant with Mae, she revealed on social media that she got exposed to COVID-19 and quarantined from her family.
Duff and Koma, also 33, tied the knot in December 2019 in Los Angeles, before welcoming their first child Banks the year prior. Duff shares nine-year-old Luca with ex-husband, ice hockey player Mike Comrie.
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