McCartney, Lady Gaga make music
Sir Paul McCartney has teamed up with Lady Gaga for new music - after she revealed she initially hung up on him.
The Poker Face singer admitted she was so shocked to receive a call from the Beatles star that she mistakenly assumed it was a prank caller.
"Always a good time with my buddy," she wrote on Instagram, alongside a photo of her with Sir Paul in the studio.
"I'll never forget when he called me last year to work and I hung up the phone cuz I thought it was a prank!" the 28-year-old singer added.
Lady Gaga also shared an image of her with Sir Paul and his band.
"Had a beautiful session with Sir Paul McCartney and friends. Working on one of his many secret projects! Killer musicians, vibe, and lots of laughs," she captioned the group shot.
Sir Paul has recently collaborated with Rihanna and Kanye West on the single FourFiveSeconds. The trio are to perform the track at the Grammy Awards on Sunday (February 8).