The couple's "True Blood" co-star Alexander Skarsgard has also been booked for Sunday's event honoring the season's best in television.
The trio joins previously announced presenters Will Arnett, Stephen Colbert, Edie Falco, Tina Fey, Laurence Fishburne, Ricky Gervais, Jon Hamm, January Jones, John Krasinski, LL Cool J, Julianna Margulies, Joel McHale, Matthew Morrison, Eva Longoria Parker, Jim Parsons, Matthew Perry, Keri Russell, Blair Underwood and Sofia Vergara.
The telecast is to be broadcast live from the Nokia Theatre LA LIVE in Los Angeles on NBC.
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