Justin Timberlake and Jessica Biel Are Having a Baby Girl!

Justin timberlake jennifer aniston having a baby girl

It'll be a baby girl for Justin Timberlake and Jessica Biel!

Getty Images

Exciting news for expectant parents Justin Timberlake and Jessica Biel — they're reportedly having a baby girl!

"They couldn't be more thrilled," a source tells 'Life & Style.' "Jessica's getting everything set for their little princess."

And she's definitely not wasting any time. The actress, 32, isn't believed to be due until late spring, but she's already picked out a design for the nursery in their LA home.

Jessica Biel

The duo in 2013. (Photo Credit: Getty Images)

"She and Justin agreed on a jungle theme," an insider says. "They don't want frills or anything too feminine, so they commissioned an artist to paint the walls with wild animals, like elephants, zebras and monkeys."

And Justin, 33, is stocking the nursery his way. "He's going to get his little girl a drum set and a guitar," the insider says, "because he wants her to share his passion for music."

As first-time parents-to-be, Justin and Jess are both nervous about what lies ahead. Luckily, they're getting A-list help.

RELATED STORY: Jessica Biel Shows Off Growing Baby Bump One Month After Pregnancy Reveal

Justin has talked to his 'Friends With Benefits' co-star Mila Kunis, who gave birth to her own daughter with fiancé Ashton Kutcher last October.

"Mila invited Justin to bring Jess over to play with her and Ashton's newborn, Wyatt," says the insider.

Hey, can we get in on that play-date?!

For more on Jessica and Justin's baby prep, pick up the new issue of 'Life & Style,' on newsstands now!

Keep up with Justin Timberlake in the pages of Life & Style by subscribing now!