Pregnant Paquin's tight True Blood tees don't fit

Anna Paquin in one of the T-shirts from True Blood that she no longer fits. Photo / Supplied

Anna Paquin's growing baby bump is causing problems for the writers of hit vampire TV show True Blood.

Paquin, who is pregnant with her first child with husband and True Blood co-star Stephen Moyer, no longer fits the T-shirts that her character Sookie Stackhouse wears while waitressing at Merlotte's restaurant.

Her expanding baby bump is causing problems for the show's writers because they are trying to conceal her pregnancy.

Creator Alan Ball explained: "So, in the last few episodes, Sookie's holding a big purse in front of her at all times.

"I actually heard from the costume designer about midway through the season, she went, 'Sookie can't wear a Merlotte's [restaurant] T-shirt anymore.'

"And I went, 'Well, it's a good thing Sookie isn't really at Merlotte's anymore, she's basically trying to save the world.'

"So, we'll put her in loose-fitting, save the world outfits."

Paquin also confirmed that her pregnancy won't be reflected on screen.

She said: "At this point, [Sookie] doesn't have a boyfriend on the show."

Meanwhile, Moyer thinks Paquin's pregnancy adds "more crazy" to his life.

The 42-year-old actor - who has kids Billy, 12, and 10-year-old Lilac from previous relationships - and his 29-year-old wife are expecting a baby together and the True Blood star can't wait to be a dad again.

He told Zap2it: "I love my kids so much. And I think that the fact that Anna is pregnant just adds more crazy to the bundle of fun."

Paquin is enjoying her pregnancy and is not experiencing any ill-effects.

She said: "I feel great."

Watch the trailer for season five of True Blood:

- Bang! Showbiz