The Green Day frontman attended one of the pop star’s Eras Tour stops in Lyon, France, this week

Billie Joe Armstrong had a rocking good time at Taylor Swift’s Eras Tour this week.

The “American Idiot” rockstar, 52, attended one of the pop icon’s concerts in Lyon, France, and had nothing but good things to share about his experience. “Just saw Taylor Swift eras tour in Lyon France 🇫🇷!!” he wrote in an Instagram caption. “Great production. Great voice. Great entertainer. Great songwriting. Crazy crowd.”

In his post, the Green Day frontman also shared a photo of himself sporting a pair of friendship bracelets he accepted from fans at the show before expressing more gratitude toward Swift.

“Thanks a million @taylorswift,” Armstrong added. “My bracelets say #sexybaby #assh— outlaw.”

Taylor Swift performs at Groupama Stadium on June 2, 2024 in Lyon, France.

JOHN SHEARER/TAS24/GETTY

The fun of exchanging friendship bracelets has become a pretty notable trend throughout Swift’s live concerts. A gang of fellow celebrities have since hopped on the wave, including Selena Gomez, Halsey, Lance Bass, Sarah Paulson, Lupita Nyong’o, Kumail Nanjiani, Mindy Kaling, Simu Liu, Joe Locke, Mariska Hargitay, Savannah Guthrie, Flavor Flav and now Armstrong.

Even the 34-year-old singer’s NFL star boyfriend, Travis Kelce, joined in on the phenomenon while attending her Eras Tour show in Sydney, Australia, back in February.

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This week, Swift’s Eras Tour continues its international run in Edinburgh, Scotland, from June 7-9. The overseas shows will conclude in London in August before the entire tour wraps up this December in Canada.

The Tortured Poets Department artist has been enjoying performing for her fans around the world, as she’s done nothing but show appreciation for their continued support, no matter the circumstance.

Taylor Swift performs onstage for the opening night of “Taylor Swift | The Eras Tour” at State Farm Stadium on March 17, 2023 in Swift City, ERAzona.

JOHN SHEARER/GETTY

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During her rainy Lyon concert on Sunday, June 2, the “Down Bad” musician praised attendees for being “absolute champions and heroes for dancing even harder when it started raining,” per footage posted on X.

“Merci, Lyon!! We loved playing for you, dancing with you, and singing with you in the rain! Yep we had our first official 🌧️ RAIN SHOW 🌧️ of the European leg of The Eras Tour!!” Swift posted to Instagram Tuesday. “Loved every minute of both shows. See you 🔜 Edinburgh…”

Armstrong, meanwhile, is heading on the road with his band next month to support their 14th studio album, Saviors, which dropped on Jan. 19. The legendary pop-punk trio announced their massive 2024 tour in October, with stops all across North America, plus Europe and the U.K. Opening acts include The Smashing Pumpkins, Rancid and The Linda Linda.