Song Sparked Stephen Moyer's Marriage Proposal to Anna Paquin
10/26/2009 AT 07:30 AM EDT
"There's a song Bill listens to in the car about a white sandy beach," Moyer tells British Glamour magazine in its November issue. "So we decided to go away for a break – to a white sandy beach – and that's where it happened."
Moyer, 39, and Paquin, 27, managed to keep their off-screen romance a secret on the set until an awkward love scene forced the actor to do the honorable thing and 'fess up.
"One of the cast had to do an intimate scene with Anna," says the Brit actor. "I felt it would be so wrong for him to do it, then find out down the line that we were together."
Like many of the couple's fellow costars on the hit HBO series, the cast member's reaction was one of utter shock. "So after 10 months, we had to tell him," said Moyer. "He couldn't believe it!"