NEW YORK (February 20, 2013)--Five months after undergoing a bone marrow transplant, Robin Roberts was back on television in the morning Wednesday.

Roberts said she’d waited 174 days "to say this, good morning America."

The morning-show host is recovering from MDS, a blood and bone marrow disease.

She looked thin with close-cropped hair, but was smiling broadly, back at work on "Good Morning America" at ABC's studio in New York City.

ABC announced Roberts will interview first lady Michelle Obama later this week, to be shown next Tuesday.