Olympic gymnastics star Gabby Douglas was hospitalized Sunday night, forcing her to miss a scheduled appearance with her U.S. teammates at the MTV Video Music Awards. "Gabby is back in the hospital tonight being treated for a seriously infected past mouth injury. She continues to have deep swelling and adverse reactions to medications,'' publicist Lesley Burbridge said in an email to The Associated Press. Earlier Sunday, 20-year-old Douglas posted on social media that she was out of the hospital. "Out of the hospital & resting comfortably,'' Douglas said on Instagram. "#FinalFive so sad I can't be with u all to present tonite (at) MTV thank u xoxo #VMAs #myview.'' Douglas had been scheduled to present an award alongside teammates Simone Biles, Laurie Hernandez, Madison Kocian and Aly Raisman at Madison Square Garden.