Pete Wentz Fall Out Boy Pizza Bronx Mogwai
Pete Wentz Fall Out Boy Pizza Bronx Mogwai

You better get him home, Pete -- poor Bronx looks like he's so hungry he's gonna eat the pizza box!

This adorable father-son pair spent some quality time together enjoying thin crust pepperoni the day before Father's Day while mom Ashlee Simpson was enjoying some solo time.

Pete's parents were along for the ride as well, making it a multi-generational celebration. Oh, and cutest thing ever ... watch the video to see what Bronx does with the pizza!