The singer-and-actress - who has two-year-old twins Emme and Max with her husband Marc Anthony - is reportedly keen to extend her brood and have a new son or daughter.
Her close friend Leah Remini told People.com: "Jen would love to havemore kids."
However, until the 41-year-old star has a new baby, she will be busy working on the new series of `American Idol`, which she adores.
Discussing her pal`s new job, Leah added: "She loves it. This is one of her favorite jobs because Jennifer loves artists. Jennifer loves to find somebody. She`s a fan of the show. Jennifer really wants to find `it.` "
Jennifer has also been praised by show boss Nigel Lythgoe for her work on the series, where he has nicknamed her the programme`s "alpha female".
He claims the new panel - also consisting of Steven Tyler and original judge Randy Jackson - work well together and are "kind" to contestants as well as tough.
He explained: "It`s new and fresh, which is a big difference.
"It`s just a lot of fun to work together.
"They`re all kind, but they`re tough. You`ve got to look at their backgrounds and what they`ve been through. So they`re not going to be cruel. They`re not going to be like, `Pack your suitcase - you`re going home.` The integrity is going to be there."