Anna Paquin and Stephen Moyer welcomed twins in September 2012 but have kept mum about their new bundles of joy -- until now.

At the June 11 True Blood Season 6 premiere in Hollywood, Moyer finally opened up about their nine-month-old babies.

E! News asked the actor, 43, about his Father's Day plans, and Moyer said that he'll be spending Father's Day (Sunday, June 16), "hanging out with Charlie and Poppy."

Paquin said she does have a Father's Day "surprise" for Moyer, but wouldn't spill on details.

"I can't tell you because that would ruin the surprise," she laughed.

"I don't know about [it being a] big surprise, but yes, there are plans."

The new season of True Blood premieres on HBO on June 16.

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Anna Paquin, Stephen moyer, True blood