Ben Affleck and Jennifer Garner Crash Kid's Birthday Party!

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It seems Batman showed up to Superman's birthday party over the weekend!

Ben Affleck and his bride Jennifer Garner surprised guests at a kid's Superman-themed birthday party in Detroit on Sunday when they crashed the bash, held at Detroit Kid City.

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Affleck is playing Batman in the upcoming Zack Synder film Batman v. Superman: Dawn of Justice, and is in Detroit shooting the film. The A-list couple asked guests if their two-year-old son Samuel could hang out at the party, the Detroit Free Press reports. Obviously, guests welcomed the celebrities with open arms.

"I spoke with Ben for 10 or 15 minutes and he was very pleased with the facility. He was very interested in getting a Detroit Kid City out in L.A.," Garrett Dixon of Detroit Kid City told the publication. "He said they had a blast and will definitely be in contact with us."

This isn't the first celebrity family to hit up the kids venue. In 2013, Mark Wahlberg's kids went there while he was shooting Transformers: Age of Extinction.

Who would you want to crash your party?