Pete Wentz and Ashlee Simpson want Jessica Simpson’s ex-boyfriend to serve as godfather to their first child, due in October.

Pete and Ashlee are considering asking rocker John Mayer, a close pal of Pete’s, to take on the spiritual duty, although the newlyweds are concerned about Jessica’s reaction to the idea of the man who dumped her becoming a permanent fixture in her family..

“Pete and Ashlee know that and they think he would make a great godparent.”

“They are not sure how Jessica would feel about her ex having such a strong link to her new niece,” a source tells The Sun.

“John gets a bad rap and is always portrayed as a bad boy but he’s got a heart of gold.”