Anna Paquin, the Hollywood actress, has said she was bemused at the fuss around her coming out as bisexual.

The X Men and True Blood star filmed an advertisement in April for gay charity The True Colors Fund. In it, she says: “I’m bisexual and I give a damn.”

The 27-year-old, who is engaged to her True Blood co-star Stephen Moyer, had never mentioned her sexuality publicly before and had never been linked to another woman in the media.

But she told Zap2it: “It wasn’t like it was a big secret.

“It was just a cause I cared about and privately supported.

“I’m not someone who endlessly talks about her personal life for no reason, but obviously, as someone who identifies as bisexual, those are issues I really care about and frankly, I don’t see why everyone doesn’t care about them.”

Paquin added: “So when I was asked to participate in that PSA it was just an obvious, ‘Well, of course I will.’ Obviously I know that one person’s voice doesn’t necessarily do that much, but I just wanted to do my bit.”