"Mommy and Daddy love you so much!!!" Monét captioned an adorable photo of the newborn holding her finger. "Welcome to the world."
The singer's post drew numerous congratulatory messages from fellow artists like Sam Smith, Dua Lipa and Khalid.
Gaines shared the same sweet photo of his girlfriend and daughter on Instagram. "I love you @victoriamonet," he wrote. "Thank you for the best early birthday gift I could ask for," and adding the hashtag "girl dad."
Monét commented on his heartfelt post, writing, "We love you too baby!! family forever."
The "Moments" singer revealed her baby bump in December with some goddess-like photos of herself on social media.
"I'm so happy to share that I've been promoted to the title just above Queen... Mom," she captioned the beautiful images. "Two hearts beat inside of me now...That's more love. Two brains and two souls...that's so much power. Really been feelin like the ultra super Victoria cause my body is doing such miraculous work. This is absolutely the best thing that has ever happened to me and I can't wait to meet my tiny soul mate earth side!!!"
Monét added, "I hold my head higher with the confidence you already gift. You are the best of me and I promise to protect you and be the best version of myself for you all ways, always."
See her birth announcement on Instagram here.