Hip-hop star Jay Z staged a mock proposal to wife Beyonce on the red carpet for the 2014 Met Costume Institute Gala after she dropped one of her rings.

The superstar couple were among the A-list guests at the annual New York City event on Monday (05Apr14).

The Crazy in Love hitmaker donned a sheer black Givenchy dress with a veil headpiece, but when she dropped one of her Lorraine Schwartz rings, her chivalrous husband was quick to pick up and perform a pretendproposal in front of photographers.

Beyonce and Jay Z weren't the only head-turning couple at the charity ball - Ryan Reynolds and Blake Lively, Andrew Garfield and Emma Stone, Victoria and David Beckham, Gisele Bundchen and Tom Brady, Charlize Theron and Sean Penn, Johnny Depp and his new fiancee Amber Heard, and Michael Sheen and Sarah Silverman, were all among the attendees.

The bash, overseen by Vogue U.S. editor Anna Wintour, was co-hosted by Sarah Jessica Parker and Bradley Cooper, and was held at the Metropolitan Museum of Art.