Before settling on her gold Stella McCartney gown, the True Blood star tried on "about a hundred" dresses, she tells UsMagazine.com.
"I'm probably exaggerating," she jokes.
The work didn't end there. The actress, 27 -- who paired her gown with vintage Stephen Russell jewelry and an Alexander McQueen bag -- tells Us she had "a
team" of people helping her prep in the hours before she walked the red carpet alongside costar and fiance Stephen Moyer, 40.

Still, the two managed to enjoy their "date night" on Sunday.

