The breakfast meeting comes after Wentz reportedly met with Ashlee's sister Jessica to talk about his split from his wife of three years.
Ashlee filed for divorce on 9 February (11).
The couple was spotted together on Valentine's Day (14Feb11) and again in March (11), but sources told X17.com Wentz and Simpson were keeping their relationship strictly platonic.
The new family photos, published by the website, suggest they're happy and in love again.
And in a tweet on Thursday (31Mar11), Simpson wrote, "Had a perfect 2 days with my best friend," suggesting she's having fun with her rocker husband.