Bradley Cooper performs ‘Maybe It’s Time’ with Pearl Jam

Bradley Cooper joined Pearl Jam for a surprise appearance at BottleRock Napa Valley.

The actor performed 'Maybe It's Time' with Eddie Vedder at the food and music festival over the weekend.

"Please would you join me in welcoming to the stage my great, great pal, Bradley Cooper," Eddie said.

A video shared by YouTube user Rholedz shows Bradley taking a bow after the performance as the audience cheered him on.

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'Maybe It's Time' was recorded as an original song for Bradley's 2018 movie with Lady Gaga, 'A Star Is Born'.

Social media users described Bradley and Eddie's performance as "freaking awesome".

"I got goosebumps. Absolutely beautiful," one YouTube user wrote.

Another user added: "Omg! That was just incredible!! Wow! Bradley sounded amazing , they harmonized great together, Eddie always sounds amazing singing that song ! Wow, wow, wow!"

Several A-list stars were spotted at Bottlerock over the weekend, including Bradley's girlfriend, model Gigi Hadid.

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Other celebrities who appeared included Cameron Diaz, Golden State Warriors basketball player Stephen Curry, and 'Sister Sister' star Tamera Mowry-Housely.

"@bottlerocknapa you always take good care of the Housley’s! We love you 🙌🏽 Thank you for an amazing first day! Always enjoy rockin it with my bestie @adamhousley," Tamera wrote on Instagram.