Madonna made an unexpected appearance on the red carpet at the UK premiere of Sin City on Monday, surprising some of the film's stars.
The celebrity couple were a last minute addition to the guest list
The singer turned up at the Empire Cinema in London's Leicester Square with film director husband Guy Ritchie.
The thriller Sin City stars Brittany Murphy, Bruce Willis and Clive Owen.
Murphy, who was signing autographs for fans outside the cinema when the famous couple arrived, admitted being star-struck.
"She's my idol," said the 27-year-old, who also appeared in 8 Mile with rapper Eminem.
Actress Brittany Murphy said Madonna was her idol
"If I meet her at the party, I will shyly and meekly shake her hand."
Madonna and Ritchie were reportedly a late addition to the Sin City guest list.
The film, based on a comic book by writer Frank Miller, was up for the Palme d'Or prize at the Cannes Film Festival last week.
Sin City director Robert Rodriguez and actors Jessica Alba and Michael Madsen were also at the screening.