Gabby Douglas, a member of the US women's national gymnastics team, missed the MTV Video Music Awards due to an illness.
Douglas and her teammates, dubbed as the 'Final Five' by the media, were scheduled to present the award for Best Female Video.
Douglas posted a photo of herself wrapped in a blanket on Instagram, explaining why she did not attend the award function.
"Gabby is back in the hospital tonight being treated for a seriously infected past mouth injury," Douglas' publicist was reported by the celebrity news website PEOPLE as saying. "She continues to have deep swelling and adverse reactions to medications."
Simone Biles, the 2016 Olympic individual all-around, vault and floor gold medalist, acknowledged her teammate when presenting the award and said, "Feel better, Gabby!"
Ali Raisman, one of Douglas' teammates posted a picture of the other four members on Instagram, wishing her well.
Douglas became the first African-American to win the Olympic title in London in 2012. But in Rio she finished seventh in the eight-woman uneven bars final.
Other Olympians attending the gala included US swimmer Michael Phelps who introduced the rapper Future whom he called an inspiration.
Beyonce dominated the Video Music Awards with a near-record eight wins.
(WION with inputs from AFP)