The Fall Out Boy rocker - who split from the 28-year-old singer in February 2011 after two and a half years of marriage - says the duo get along really well now because they are focused on co-parenting their four-year-old son Bronx.
The 33-year-old bassist told Bravo's 'Watch What Happens Live' on Monday (15.04.13): ''I feel like we both realise that we're parents and we're in it for our kid. That's made it really easy. I feel like, as a mom, she's awesome. She's an awesome mom and we get along really well when it comes to our kid now.''
Pete, who is now in a relationship with model Meagan Camper, also praised Ashlee's father and manager Joe Simpson.
He said: ''I think he is a really great grandfather. Really good guy.''
Ashlee has been single since splitting from her boyfriend Vincent Piazza last November.
The actress-and-singer and the 'Boardwalk Empire' decided to end their 18-month relationship as their busy schedules were keeping them apart.
A source previously said: ''Vincent has been working a lot, so he hasn't been able to spend as much time with Ashlee, which has caused some problems. It was a mutual agreement to split, but things have been bumpy for a little while, so perhaps they might reconcile.''
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