The couple welcomed Onyx Solace Morissette-Treadway on June 23.
The singer shared the happy news on Instagram with a picture of the newborn, and the caption “She’s here!” and hashtag #beyondblessed.
“She’s here! Onyx Solace Morissette-Treadway June 23 2016 #beyondblessed,” Morissette, 42, captioned a photo of her newborn baby girl nursing.
The couple, who are already parents to big brother Ever Imre, 5½, were married in 2010 at their home in Los Angeles. The new mom of two announced her pregnancy on her website in February, with a sweet video that ended with Ever gazing at the ultrasound photos.