Fall Out Boy bassist Pete Wentz and his model girlfriend Meagan Camper are expecting a baby!

Wentz, 34, shared the news via a super romantic, inverted Instagram photo, where he and his baby mama are seen locking lips and holding hands, with one of his hands on her belly. They've been a couple since 2011.

The musician captioned the photo: "we're super excited to announce we're expecting a baby!"

We're super excited, too.

Wentz and his ex-wife Ashlee Simpson are parents to son Bronx Mowgli, 5. Simpson recently announced that she has gotten engaged to new BF Evan Ross, son of diva Diana. So while she may have beaten her ex-hubby to the "I'm getting married again" punch, he beat her to the "I'm having another child" punch!

It's good news for little Bronx, since he is getting a playmate.

There was actually a false report circulated when the pair first started dating that Camper had a miscarriage. This is their first bundle of joy-to-be.

More From MIX 108