No plot spoilers were revealed at the “True Blood” season 6 premiere party, but some secrets spilled out just like the blood on the graphic HBO vampire series. Anna Paquin and Stephen Moyer let loose with the names of their twin babies, which have been a carefully guarded secret since they were born in September last year.

The “True Blood” season 6 premiere party happened last night at ArcLight Cinemas Cinerama Dome in Hollywood. Anna Paquin, 30-year-old Canadian actress who was wearing a David Koma dress, YSL shoes, a Jimmy Choo clutch, Melinda Maria earrings, and a Jacob & Co. necklace, was happily queried when she hit the red carpet with her co-star and husband Stephen Moyer. The couple were married in August, 2010.

The “True Blood” costars gave birth to twins 9 months ago and have stayed mum on most details about them, including their names, until the Moyer let it slip that he would be spending Father’s Day with his twins Poppy and Charlie.

Stephen Moyer, the 43-year-old actor that plays vampire Bill on the Southern Gothic Vampire series, blurted the twins’ names after he mentioned that Lilac, his 10-year-old daughter from a previous relationship, was headed off to a sleep-away camp this weekend. He said on Father’s Day he would be "hanging out with Charlie and Poppy."

Anna Paquin, who plays the telepathic waitress who serves up synthetic blood at the Bon Temps bar “Merlotte’s” told reporters that she has a Father’s Day "surprise' for her husband, but she couldn't give more details because he was standing right there. Paquin laughed "I can't tell you because that would ruin the surprise. I don't know about [it being a] big surprise, but yes, there are plans."

The new season of HBO’s "True Blood" premieres on June 16. Charlene Harris, who writes the Sookie Stackhouse book series that the show is based on, recently released the last of her Southern Vampire Mysteries, “Dead Ever After.”