The US singer, who is mum to Maxwell and Ace, was pictured showing off her post-baby curves in an all-black outfit at LAX Airport in Los Angeles yesterday.
Jessica was wearing a tight pair of leather trousers, a low cut top and a fluffy jacket to keep her arms warm, not to mention the ultimate celebrity airport accessory - oversized sunglasses!
In July, Jessica gave birth to her and fiancé Eric Johnson's second child, their son Ace Knute.
The couple are also parents to daughter Maxwell Drew, who was born in May 2012, and earlier this week Jessica shared some gorgeous family photos on Instagram.
In one, Jessica is cuddling Ace and alongside it she commented: "Ace is the place that I become the annoying kissing mum. All I want to do is snuggle this lil emotional perfect soul! He is a dream!"
In another snapshot, Maxwell is trying on a pair of her mum's boots. Jessica joked: "Raiding mum's closet. I don't blame her! She is too young to steal ;)"
Finally, Jessica uploaded a gorgeous picture of Eric holding Maxwell and Ace on his lap while they were wrapped up in towels: "Bath time buds," she said. Aw!
Jessica and retired NFL player Eric got engaged in November 2010, however the births of their children mean they haven't quite managed to make it down the aisle yet.
Speaking on US show Good Morning America earlier this month, Jessica said: "We don't have an actual date but we do know that we want it to be this year. We need to get married."