Liv Tyler is one hot mama!

The 38-year-old pregnant actress took to Instagram on Tuesday, March 22 to share an adorable photo of her growing baby bump — and she looked positively glowing in the pic!

"Momma's at work. Growing babies and designing for Belstaff. So fun!" Liv captioned the sweet snapshot of herself posing alongside her friend as they showed off their matching bellies in all-black ensembles.

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Liv and her fiancé, David Gardner, previously announced they are expecting their second child in January 2015. The happy couple welcomed their first child, son Sailor, in February 2015. The Armageddon star is also a mom to an 11-year-old son, Milo, with her ex-husband, musician Royston Langdon. David additionally has a son, Gray, 8, from a previous marriage.