January 9, 2015 11:16 AM EST

This Minneapolis couple thought there was just the two of them in a photo booth. But turns out there was secretly a third.

While the camera was snapping photos of Jessica and Michael Devins, she held up a white hat for newborn babies that said “baby” on it.

“I actually started taping my iPhone to the front wall of photo booths to capture video of our silly faces a few months ago,”she writes in the description of the video on YouTube. “That way he wouldn’t be suspicious when I was finally able to share the happy news.”

Read next: Watch a Guy Propose to His Girlfriend in the Cutest Possible Way at a Gaming Marathon

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Write to Olivia B. Waxman at olivia.waxman@time.com.

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