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Pete Wentz and son Bronx, who turns 3 in November, are getting ready for Halloween!

The father-son duo picked up costumes in LA on Sunday, and Pete checked out a Garfield get-up for Bronx! Cute!

Though Pete's new girlfriend, model Meagan Camper, has been getting close with Bronx -- she was nowhere to be seen this weekend. We like that Pete still makes time for just him and Bronx!