Robin Roberts Thanks Viewers, Celebrities for Their Support

One day after announcing to the world that she's been diagnosed with MDS, a rare blood disorder that will require chemotherapy and a bone-marrow transplant from her sister, Robin Roberts was back in her Good Morning America chair this morning.

"I slept like a baby last night for the first night since my diagnosis," Roberts said on air. "My family and I are overwhelmed and comforted by the response from everyone."

And those responses include many well wishes from celebrities, including Tweets by Josh Groban, Rob Lowe and Katie Couric. Michelle Obama also chimed in on the micro-blogging network with:

"Barack and I have you in our prayers. We believe in you and thank you for bringing awareness and hope to others."

But the health status of Roberts - one of television's best known and most respected interviewers - crosses political party lines, of course, as the journalist said she also had a  "lovely conversation with Ann Romney who has had her health challenges."

(Ann Romney was diagnosed with Multiple Sclerosis in 1998.)

Roberts has also heard from Erin Andrews, Kristin Chenoweth and Gayle King and simply says all the feedback has been "very comforting."