Anna Paquin is pregnant with twins.

The 29-year-old actress is expecting for the first time with husband Stephen Moyer - with who she stars in 'True Blood' - and their co-star Sam Trammell, who is also a father of twins, has confirmed the pair will be having two babies.

He told Us Weekly magazine: ''I'm so excited for them. We sent them a special gift. It's so interesting that 'True Blood' has become like, the 'twins' show.''

Giving his advice, Sam urged the pair just to ''hold on tight'' as it is tougher having multiples but he admitted he didn't know any other way of parenting.

He added: ''It's harder, having twins, but it's all we know. So we're trying to impart some decent wisdom. I told them to hold on tight.''

Stephen, who has children Billy, 12 and Lilac, 10 from previous relationships, recently joked Anna being pregnant brings the ''crazy'' to his already extended family.

He said: ''I love my kids so much. And I think the fact that Anna is pregnant just adds more crazy to the bundle of fun.''