Daily roundup of what's hot online right now with "Good Morning America's" Robin Roberts revealing another life-threatening medical issue, Matthew McConaughey's wedding and more.

Trending topic: 'Good Morning America'

Robin Roberts, an anchor of "Good Morning America," announced this morning on the show that she is fighting a rare blood disorder called myelodysplastic syndrome, a disease of the blood and bone marrow. She will undergo surgery to remove her bone marrow and replace it with her sister's, which is a perfect match. Chemotherapy begins immediately. Roberts underwent successful treatment for breast cancer several years ago, and this disorder may have stemmed from her cancer. Click on the link above to watch this morning's segment.

Check this out: Matthew McConaughey's wedding

Matthew McConaughey married his longtime girlfriend Camila Alves over the weekend. The three-day extravaganza took place in Austin, Texas, according to HuffingtonPost.com, and the star-studded guest list included celebs like Reese Witherspoon, Meg Ryan and Woody Harrelson. According to People magazine, the bride and groom whispered their wedding vows to each other, and no one knows what they said, but Alves was teary-eyed by the end.

Video: Robin Roberts reveals rare blood disorder

The "Good Morning America" host who beat breast cancer reveals she's facing another medical issue. Watch Robin's tearful announcement.

-- GateHouse News Service