Bradley Cooper joined Lady Gaga on stage Saturday night in Las Vegas. The “A Star is Born” cast members sang their Oscar-nominated song “Shallow.”

Gaga is currently in the middle of a residency in Vegas. The solo version of “Shallow” is often part of her set list, but Cooper came out to sing with her on Saturday night. Lady Gaga brought him up from the audience and helped adjust his in-ear monitors before they sat down to sing.

“A Star is Born” fans who weren’t lucky enough to be at the Park Theater at Park MGM Las Vegas this weekend will get to see Cooper and Gaga perform live soon enough. The duo is expected to perform their “Shallow” during the Academy Awards.

Typically, all the best song nominees get to perform their song on the Oscars broadcast. Cooper and Gaga were discussing performance possibilities long before nominations were even announced.

“We talked about that actually, because I’m such a maniac,” Cooper told Variety in November. “I started texting her the whole pitch of how we should do it. So we’ll see. There might be a cool, unorthodox way we could perform it.”

Was this a test-run for their Oscars performance? Fans will have to wait and see. The Oscars air Sunday, Feb. 24 on ABC. “A Star is Born” has eight nominations, including best picture, best actress and best actor (though Cooper was snubbed in the best director category).

First, however, Gaga has to wrap up the first leg of her Vegas residency. She’ll finish on Feb. 3, just in time for Oscar season. The best actress nominee will return to the Park Theater in late May.

A Star is Born
Bradley Cooper and Lady Gaga performed "Shallow" in Las Vegas. They are pictured in "A Star is Born." Neal Preston/Warner Bros. Entertainment/Metro-Goldwyn-Mayer Pictures