Michael Rozman/Warner Bros.
Will Robinson
April 27, 2016 AT 12:00 PM EDT

Julia Roberts and Ellen DeGeneres talked about one of their commonalities: They each shared a stage with Taylor Swift during the pop star’s 1989 tour.

The actress popped up during Swift’s Santa Clara, California stop in August and danced on stage with ‘60s counterculture icon Joan Baez. Watching footage of the moment, though, shocked Roberts.

“I’ve never seen this — I don’t think that should actually be viewed,” she told DeGeneres.

“You really dressed up for that appearance, didn’t you?” DeGeneres deadpanned, referring to Roberts’ on-stage wardrobe of a 1989 T-shirt. “I didn’t dress for 50,000 people,” Roberts defended.

Meanwhile, the host popped up a few weeks later on stage with Swift in Los Angeles in a dress similar to the singer. “I knew what she was wearing, and I surprised her,” DeGeneres said. “She had no idea.”

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Before heading on stage, Roberts polled her kids — who were attending their first concert — on what she should do. One insisted she should absolutely go through with it. Her 8-year-old son, though, had one condition: “‘Mommy, only do it if you feel comfortable,'” Roberts recalled.

See the interview clip below.

Roberts’ full interview runs on The Ellen DeGeneres Show on Thursday.

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