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On Wednesday Pete Wentz was snapped running errands with his adorable son Bronx in the valley, and we can't believe how big the 3-year-old is getting!

The other day the Fall Out Boy rocker tweeted, "The hunt go Halloween costumes has begun - for me and the mini human." Can't wait to see what little Bronx is this year! Think Pete's ladylove Meagan Camper will be joining them when it's time to go trick or treating?