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Pete Wentz, Ashlee Simpson, Meagan Camper

Sam Sharma/Miguel Aguilar, PacificCoastNews.com

Nothing strange about this, from the Iron Man mask perched atop Pete Wentz's head to the fact that he's out with both ex-wife Ashlee Simpson and current girlfriend Meagan Camper.

Well, tis the season for togetherness, right?!

The trio were spotted transporting a box of props for a holiday-themed portrait session for Pete and Ashlee's son, Bronx—who celebrated his fourth birthday today!

Obviously neither mom nor dad wanted to miss their little guy's photo op—and apparently everything is chill enough in Simpson-Wentz land that an outing that includes Camper is no big deal.

Wentz, his flaxen-haired son and Camper were out together earlier this week at a farmer's market in L.A., where the adults treated Bronx to a bright-blue slushy drink.