JT and JB want another baby!

Justin Timberlake and wife Jessica Biel are turning to IVF to add to their brood after having trouble conceiving naturally, and they've already decided on the gender of their unborn child, In Touch reports.

"[Justin and Jess] were struggling to get pregnant, so they’ve recently turned to in vitro fertilization. With IVF, you can choose the sex of your baby. After thinking about it for a few days, they made the decision to only implant female embryos," a source dished to the mag.

The pair are already parents to son Silas, who was born in April 2015, so they're going for one of each.

"It’s always been Justin’s dream to have a little girl — he got really emotional when they told the doctor that’s what they wanted. The idea of having a baby girl was melting his heart. He loves being a dad and having a daughter would complete their family," the source added.

We'll be on bump watch!