Pearl Jam brought out an unlikely guest during the band’s Saturday headlining gig at Napa Valley’s BottleRock as Bradley Cooper — Jackson Maine himself — came onstage to perform “Maybe ...

The actor was famously inspired by Pearl Jam ... May 25, Bradley Cooper joined Eddie Vedder — who famously inspired his A Star Is Born character Jackson Maine — onstage at BottleRock Napa ...

Actor Bradley Cooper joined Pearl Jam onstage for an acoustic rendition of "Maybe It's Time" during the band's headlining set at the BottleRock Napa Valley festival on Saturday, May 25th.

Bradley Cooper joined his friends in Pearl Jam at the BottleRock Napa Valley on Saturday ... and invites her onstage to perform with him — though Cooper and Pearl Jam frontman Eddie Vedder ...

Academy Award-nominated actor Bradley Cooper traded the silver screen for the stage this weekend, living out a musical fantasy with Pearl Jam at the BottleRock ... would you join me in welcoming ...

During Pearl ... join Pearl Jam on their cover of Neil Young's "Rockin' in the Free World." Fan-shot video can be seen below. Pearl Jam's Eddie Vedder + Bradley Cooper, "Maybe It's Time" at ...