Pete Wentz announced on Instagram Feb. 17 that he and girlfriend Meagan Camper are expecting a baby together. Credit: Courtesy Pete Wentz

Pete Wentz is going to be a dad again! The 34-year-old Fall Out Boy rocker announced on Instagram Monday, Feb. 17 that he and girlfriend Meagan Camper are expecting a baby together.

"We're super excited to announce we're expecting a baby!" Wentz captioned a photo. In the sweet snapshot, the parents-to-be are resting side-by-side on a bed and sharing a kiss. Model Camper's white T-shirt is pulled up to reveal a tiny baby bump, which Wentz sweetly touches.

Wentz is already dad to son Bronx, 5, with ex-wife Ashlee Simpson, whom he divorced in 2011 after three years of marriage. Simpson, 29, announced last month that she is engaged to boyfriend Evan Ross.

Wentz and Camper have been dating for nearly three years. In an interview with Wendy Williams last month, Wentz hinted that he plans to marry Camper. "I think so. I mean, we talk about it a lot. I feel really lucky. It's, like, really interesting [to be] in a relationship with someone who is truly my best friend," he said. "Like, I talk to her about everything. She will tell me when I'm being not so insane, and sometimes she's like, 'You're being a little bit insane.' It's very helpful."