The couple named the girl, Alaia-Mai Humes. Reported Contactmusic.
"This morning we welcomed our baby girl Alaia-Mai Humes. Mum is doing great and baby is amazing! We are both overjoyed! Thanks for your love (sic)," Marvin posted on Twitter.
Rochelle's bandmate Una Healy, who is a mother of 14-month-old Aoife Belle, tweeted a congratulatory message to the new mother saying, "Big love and congratulations to Rochelle and Marvin on the birth of their baby daughter Alaia-Mai. So excited to meet her!!(sic)"
Oritse Williams, Marvin's JLS bandmate, tweeted, "Wow the 1st baby of JLS. Congrats Marvin and Rochelle. Alaia-Mai welcome to the big beautiful World! (sic)."