Pete Wentz praised his ex-wife Ashlee Simpson on Bravo's Watch What Happens Live April 15, calling her an "amazing mom" to their 4-year-old son, Bronx. Credit: Jason Kempin/Getty; Jamie McCarthy/Getty

Pete Wentz has nothing but love for his ex-wife Ashlee Simpson, with whom he shares custody of their 4-year-old son, Bronx. During an appearance on Bravo's Watch What Happens Live April 15, the Fall Out Boy bassist praised the "Bat for a Heart" singer's mothering skills.

"I feel like we both realize that we're parents and we're in it for our kid. That's made it really easy," Wentz said of the musician, 28. "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."

Wentz, 33, also had some kind words for his former father-in-law, Joe Simpson. "I think he is a really great grandfather," the rocker said. "Really good guy." (Joe and Tina Simpson filed for divorce in the fall of 2012 after 30 years of marriage.)

Since his split with Ashlee in 2011, Wentz has been dating model Meagan Camper. The former MTV reality star, meanwhile, dated Boardwalk Empire's Vincent Piazza for a year and a half; they split in November 2012.