“We both were very giggly about it because Amy and I are friends and all of the sudden you’re asked to do this kind of intimate moment with your girlfriend,” she recalls.
Indeed, Sarah was the picture of elegance as she teamed her dress with a pair of strappy black heels and a metallic choker.
Clearly enjoying the occasion, Sarah could barely contain her bright white smile as she posed for pictures with co-stars Pamela Soper, Amy Acker, Jim Caviezel, Michael Emerson, Kevin Chapman and Peter Roth.
If Amy's look has you craving a one shoulder dress of your own then look to our edit of asymmetric styles below.
Topshop, Whistles, Missguided and Lipsy all have chic one shoulder numbers which would be perfect for an evening event.
The star opted for a modest pair of black heels and wore her dark brown hair in a thick plait.