Actress Amber Heard has fuelled rumours she is engaged to Hollywood star Johnny Depp after she was spotted showing off a large diamond ring on her wedding finger.

Recent reports suggested The Rum Diary co-stars became engaged over the Christmas holidays (13), but neither of them commented on the story and Heard was subsequently seen hiding her left hand in front of photographers.

However, she has now been snapped showing off her new piece of jewellery - a massive ring on her wedding finger - fuelling speculation the pair is planning to marry.

Heard was seen wearing the band as she photographed her rumoured fiance while he was on stage at a gig in Anaheim, California on Saturday night (25Jan14). Keen musician Depp was performing at the Servite Theatre with stars including Aerosmith's Steven Tyler, Alice Cooper, and Marilyn Manson, while Heard snapped pictures from the side of the stage.

The actor split from his longterm partner, Vanessa Paradis, the mother of his two children, in 2012.