Organisers of a celebrity campaign against California's gay marriage ban have denied reports singer AUBREY O'DAY ruined a recent photoshoot with her demanding behaviour.

O'Day, who shot to fame as part of Sean 'Diddy' Combs' girlband Danity Kane, signed up to appear in a series of adverts to stand against the Proposition 8 legislation, which saw same-sex unions outlawed in the state last year (08).

Gossips have since speculated on rumours she turned up late for the photo session and demanded her own hair and make-up team.

But founders of gay rights advocate group NOH8 have refuted the claims - insisting the shoot wasn't marred by the singer's behaviour.

A rep for the campaign says, "It is unfortunate that while doing something for the greater good someone found pleasure in trying to tear it down. Aubrey believes in marriage equality which is exactly what this campaign is about.

"We had a great time shooting her and we can't wait to release the PSA next week. Aubrey O'Day and the NOH8 Campaign will continue to work together in the fight against hate and discrimination."