Christina Aguilera

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Christina Aguilera and Tony Bennett will perform a duet of the song "Steppin' Out (With My Baby)" at the 59th annual Primetime Emmy Awards, to be held September 16 at the Shrine Auditorium in Los Angeles. The two singers first performed the song live together on the 2006 Emmy-winning special "Tony Bennett: An American Classic."

In other Emmy news, more celebrities have been named as presenters at the show. They include Alec Baldwin, Stephen Colbert, Marcia Cross, Ellen DeGeneres, Tina Fey and Julia Louis-Dreyfus. They join previously announced presenters Steve Carell, Jon Stewart, Katherine Heigl, Kelsey Grammer, the cast of “Entourage,” Kate Walsh, Hayden Panettiere, Kiefer Sutherland and Patricia Heaton.

Radio and TV personality Ryan Seacrest will host this year's Emmy Awards.