Liv Tyler has left question marks hanging over her marriage to British rocker Royston Langdon, after posing at New York's Costume Institute Gala on Monday night without a wedding ring.

The couple married in March 2003, and have a three-year-old son, Milo.

But sources claim the relationship has been on the rocks for some time; rumours seemingly confirmed when Tyler strolled the red carpet alone at the star-studded event, with a clearly naked ring finger - the same night Scarlett Johansson was showing off her brand new engagement ring.

When contacted by the New York Daily News, a representative for 30-year old Tyler refused to comment on the speculation surrounding her marriage.