Good Morning America

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Taylor Swift performs on ABC's "Good Morning America" on Oct. 23, 2012, in New York. (Charles Sykes/Invision/Associated Press)

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"Good Morning America" weatherman Sam Champion (right) and Rubem Robierb, a fine-arts photographer, are to be married. (AP Photo/ABC, Ida Mae Astute)

**FILE** "Good Morning America" co-host Robin Roberts (center) poses with her sister Sally-Ann Roberts (left) and Dr. Gail Roboz on the show on Thursday, Aug. 30, 2012 in New York. (Associated Press/ABC)

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Katie Couric is one of several scheduled “Good Morning America” guest hosts during Robin Roberts’ medical leave. (Associated Press)

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Stephen Colbert is scheduled to guest-host “Good Morning America” as Robin Roberts undergoes a bone-marrow transplant this week. (Associated Press)

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**FILE** Robin Roberts, co-host of ABC's "Good Morning America," is seen here Aug. 20, 2012, during a broadcast of the show in New York. (Associated Press/ABC)

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The “Today” show, featuring the likes of (from left) Savannah Guthrie, Meredith Vieira and Matt Lauer, beat ABC’s “Good Morning America” by an average of 1.6 million viewers each day last week while broadcasting from the London Olympics. (NBC via Associated Press)

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Kevin Richardson will join his former mates in the Backstreet Boys (from left, Brian Littrell, A.J. McLean , Nick Carter and Howie Dorough) for an Aug. 31 performance on ABC’s “Good Morning America” as part of its summer concert series. (Associated Press)

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"Good Morning America" host Robin Roberts (center), with sister Sally-Ann Roberts (right) and ABC News anchor Diane Sawyer, announced on ABC's "GMA" on Monday, June 11, 2012, that she has been diagnosed with myelodysplastic syndrome, a blood and bone marrow disease once known as preleukemia. (AP Photo/ABC, Ida Mae Astute)

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"Dancing With The Stars" winners Donald Driver and Peta Murgatroyd dance on ABC's "Good Morning America" show, in New York, Wednesday, May 23, 2012. (AP Photo/Charles Sykes)