Olivia Rodrigo has a new personal favorite moment from her Guts World Tour: doing an onstage gender reveal for a pregnant fan in Atlanta on Tuesday (July 23).

In clips posted online, the 21-year-old pop star immediately got fired up to participate in the major life moment as soon as she saw someone in the pit holding up a sign that said, “Olivia, will you do my gender reveal?” Rodrigo instantly started running to the other side of the stage to get to the fan, who handed her a card enclosed with the top secret info.

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“Oh my god! I’m actually gonna cry, this is so exciting,” she gushed, asking the fan’s name. “You guys, do we think that Savannah’s having a boy or a girl?”

After cheers from the audience at State Farm Arena encouraged her to open the card, she said, “I have butterflies in my stomach.”

“Savannah, you’re having a boy!” Rodrigo cheered, cutting right to the chase without drawing out suspense. “I’m gonna cry. I can’t believe I was a part of that. Oh my god, congratulations. I’m emotional, I think that was one of the coolest things I’ve ever done.”

Rodrigo, who kept the card as a keepsake, posted another angle of the moment to her Instagram Story. “maybe my favorite thing to ever happen at a show omg,” she wrote.

For the “Vampire” singer to say that the reveal was one of her favorite tour moments carries some weight, given that she’s been on the road for a solid five months. The Guts trek kicked off in California in February, and Rodrigo has since traveled through the U.S., Canada and Europe. In September she’ll embark on a run through Asia, followed by a closing leg in Australia.

With support from Chappell Roan, The Breeders, Pinkpantheress and Remi Wolf, Rodrigo has been performing songs from both of her Billboard 200-topping albums — 2021’s Sour and 2023’s Sour — each night. At different points over the course of the run, she’s welcomed Noah Kahan, Sheryl Crow and Jewel on stage for guest performances.

Watch Rodrigo help with a fan’s gender reveal below.

Imagine Olivia Rodrigo does your gender reveal 😱

A special moment at #GUTSworldtourAtlanta 🥹🫶 pic.twitter.com/E0HOwL2HJk

— State Farm Arena (@StateFarmArena) July 24, 2024