baby park playground tattoo ashlee simpson baby park playground tattoo ashlee simpson Normally we get to see hands-on celebrity moms like Jennifer Garner and Jessica Alba enjoying a day in the park with their daughters, but it's so refreshing to see rocker Pete Wentz spending quality father/son time with his boy Bronx!

The pair (whose hair is growing!) hung out at a park in Beverly Hills on a sunny summer afternoon.

Who would have thought Pete would make such a doting dad? Since things are going so well for the couple and baby Bronx, perhaps it's time to start thinking about a little brother or sister for the big guy?