Over the weekend, the proud mom took to Twitter to celebrate her son's three month milestone.
The 33-year-old posted these makeup-free shots of her cuddling her son, who has adorable chubby cheeks, with the caption: "3 months."
Ace is her second child with fiance Eric Johnson. They already have a 1-year-old daughter together named Maxwell Drew.
And while it looks like Jess is totally loving motherhood, the singer is hoping to get back in the studio soon, too.
"I need to make music," she Tweeted on Sept. 24.
Jess hasn't released an album since 2010. Do you want to hear new music from her?
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Gallery | Celebrity Babies