Pete Wentz is going to be a dad again, Us Weekly reported.

The 34-year-old Fall Out Boy bassist/vocalist and his girlfriend, model Meagan Camper, announced that they will be expecting their first child together via Instagram on Monday.

"We're super excited to announce we're expecting a baby!" Wentz captioned a snapshot of the soon-to-be parents lying side by side on a bed, sharing a kiss and holding hands. Camper's white T-shirt is pulled up to reveal a tiny baby bump, which Wentz gently touches.

Camper also shared the same photo on her Instagram account with the caption, "Baby."

Us Weekly reported that Wentz and Camper have been dating for three years. During an interview with Wendy William on "The Wendy Williams Show," the "Best Ink" host hinted that he plans to marry Camper.

"It's insane that she hangs out with me," Wentz told Williams. "I feel like, 'hot girl pictured with homeless man trying to beg her for change' [when we're out together].' This is like charity work here."

Wentz continued: "I feel really lucky. It's really interesting to be in a relationship with someone who's truly my best friend. 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."

Wentz already has a 5-year-old son, Bronx Mowgli Wentz, with ex-wife Ashlee Simpson. The former couple was married from May 2008 to February 2011.

Last month, Simpson, 29, announced her engagement to boyfriend actor Evan Ross, 25, son of music icon Diana Ross.