The Saturdays singer gave birth to a baby girl on Monday morning, and the pop star couple have named their new daughter Alaia-Mai Humes.
JLS star Marvin announced the happy news on Twitter, adding that they were both 'overjoyed'.
He tweeted: "This morning we welcomed our baby girl Alaia-Mai Humes..Mum is doing great & baby is amazing! We are both overjoyed! Thanks for your love x."
The couple wed last summer and Rochelle is now the second member of The Saturdays to become a mum, as Una Healy is already mum to one-year-old Aoife Belle.