Pete Wentz and longtime partner Meagan Camper welcomed their daughter Marvel Jane into the world on May 13.
And on Sunday, Wentz, 39, shared a rare image of his third child.
Marvel Jane, nicknamed MJ, was dressed in a cotton onesie and white mittens.
Bundle of joy! Pete Wentz took to Instagram on Sunday to share a photo of his daughter Marvel Jane, two months
MJ’s onesie was decorated with tiny pink flowers that matched her intricately tied headband.
And the two-month-old infant appeared to be squirming around on a bed fitted with white sheets.
Party of five: Wentz and longtime partner Meagan Camper welcomed their daughter Marvel Jane into the world on May 13
Pete and Meagan, who have been together since 2011, also share their son Saint, age three.
Wentz shares his eldest son Bronx, nine, with ex-wife Ashlee Simpson, whom he was married to from 2008-2011.
A 2015 interview with Howard Stern suggests that Wentz and Camper will eventually marry.
‘When you’re really committed to somebody, you know that you’re going to be with them, whether a ring changes that or not,’ Pete said. ‘I think it’s important to the kids. I do still believe in marriage.’
Dotting dad: MJ wore an ‘I love dad’ onesie on Father’s Day
When talking with Jaden Smith in January for Interview Magazine, the Fall Out Boy frontman explained that fatherhood has ‘grounded him.’
‘My older kid, he thinks it’s okay that I’m in a band, but he really cares if I make the pancakes right for him,’ he said.
‘It’s dad first, and then whatever I do second. Which is kinda cool. Kinda grounding in a weird way.’
Going strong: Pete and Meagan have been together since 2011 (Photo taken 2017)