Anna Paquin and Stephen Moyer, the married actors who star on HBO’s True Blood, welcomed home twins back in September, but never revealed their names...until now.

Moyer let their names slip during a special screening of the upcoming True Blood premiere, reports E! News. He said that his 10-year-old daughter from a previous relationship, Lilac, was going to a sleep-away camp for the weekend and that the couple planned on spending Father’s Day “hanging out with Charlie and Poppy.”

“I can't tell you because that would ruin the surprise,” Paquin said about her plans for Moyer on Father’s Day. “I don't know about [it being a] big surprise, but yes, there are plans.”

As Digital Spy notes, the event was hosted at the ArcLight Cinerama Dome in Hollywood. Paquin wore a black David Koma dress that showed off her post-baby body. Rob Krazinsky and Deborah Ann Woll also attended the event.

Paquin, 29, and Moyer, 42, announced that they were expecting last April and Poppy and Charlie were born in September. The couple married in August 2010.

True Blood’s sixth season kicks off Sunday night.

image: Wikimedia Commons/Gage Skidmore