Pete Wentz and little Bronx Mowgli do lunch

Singer Pete Wenz (32) took little Bronx for a lunch date at Umami Burger in Studio City, California, yesterday. Look at those curls!

Bronx just turned three over the weekend. His mom Ashlee Simpson (27) put on big a happy face and whiskers and joined ex-hubby Pete in the celebration at a local Studio City eatery called The Coop. Ashlee's sister Jessica Simpson and her fiance Eric Johnson were there too -- as well as grandparents Tina and Joe.

Ashlee and Pete split up in February, and all seems amicable between them. Ashlee's now dating actor Vincent Piazza, and Pete's dating model Meagan Camper.

Love!
xo Haley-O