Pete Wentz has revealed he and girlfriend Meagan Camper are expecting a baby together.

The 34-year-old Fall Out Boy rocker announced the pregnancy on Instagram, with a picture of him and Meagan upside down, kissing, with his hand on her tiny baby bump.

He said: "We're super excited to announce we're expecting a baby!"

Pete - who has a five-year-old son, Bronx, with ex-wife Ashlee Simpson - has been dating Meagan for almost three years,

He revealed in a recent interview he is planning to marry Meagan, saying: "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.

"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."

Ashlee - who split from Pete in 2011 after three years of marriage - announced last month that she is engaged to boyfriend Evan Ross, whose mother is the singer Diana Ross.