'True Blood' Tips: How Stephen Moyer Spies on Wife Anna Paquin

The 2011 Comic-Con crowd loved them some "True Blood" -- and "Extra" was there, catching up with the show's stars!

Stephen Moyer, who plays vampire King Bill Compton, tells "Extra" how he keeps tabs on co-star and real-life wife Anna Paquin's character Sookie Stackhouse during her sex scenes with vamp rogue Eric Northman, played by Alexander Skarsgaard.

Moyer explained, "I went up to Alex at the beginning of the season and said 'You've got a lot of sex stuff coming up with the misses, it's totally cool,' and then I literally went into his trailer and put a little GPS in his c*** sock."

Photos! The Crazy Costumes at 2011 Comic-Con, courtesy of!

Speaking of which, Paquin said this season of "True Blood" is the craziest yet. "Season 4 is nuts. It's absolutely nuts. For us, the more crazy it is, the more fun we're having."

Check out all the Comic-Con 2011 celebrity sightings!