The "True Blood" stars have managed to keep the monikers under wraps since the the tots were born in September, but Stephen accidentally let it slip while talking to E! News on the red carpet Tuesday night at the season 6 premiere of their hit HBO show.
When asked about his Father's Day plans (it's Father's Day in the US this weekend), he revealed that they consisted of "hanging with Poppy and Charlie." Oops! But, how cute!
His doting wife then chimed in saying there is something in the works for his first Daddy's Day with their new bundles of joy.
"I can't tell you because that would ruin the surprise," she said. "I don't know about [it being a] big surprise, but yes, there are plans".
Little Poppy and Charlie are the couple's first children together; Stephen has a 10-year-old daughter Lilac and 12-year-old son Billy from a previous relationship. Clearly the Hollywood hunk likes to name his girls after flowers.
Sarah Flanigan writes for omg!