Bradley Cooper surprises fans at Lady Gaga's show

Actor-director Bradley Cooper made a surprise appearance at Lady Gaga's show here.

The crowd at Las Vegas' Park Theater was treated to Cooper's surprise appearance during Gaga's finale performance of the song Shallow, according to hollywoodreporter.com.

The song, which was nominated for an Academy Award earlier this week, is the closing number of the Enigma show, the residency that kicked off in December last year. Attendees had no idea a duet was in store when the actor appeared on stage. The two embraced and he followed Gaga to the piano.

BRADLEY COOPER AND LADY GAGA

"I even got you in ears," Gaga told Cooper of the monitors used during live stage performances. "I can't hear anything," he cracked.

Following the performance, as each of Gaga's dancers took a bow and introduced themselves, Cooper shyly joined in and said, "Bradley, thank you." He then pitched his baseball cap into the crowd.

Shallow is slated to be performed at the Oscars in February, reported variety.com.

Bradley Cooper, Lady Gaga, Shallow, Academy Award, Enigma, Oscars, Las Vegas' Park Theater.