Selena Gomez Explains Hospitalization: 'I Was Very Malnourished'

Taylor Swift, Justin Bieber Win Early at 2011 Billboard Music Awards

Selena Gomez vamps it up in a sassy black dress and red heels at the 2011 Billboard Music Awards.

Selena Gomez returned to the stage Monday in Santa Monica after canceling a performance while she was in the hospital.

"I want to thank you so much for coming," the Disney star told the audience at Santa Monica Place. "If you guys came on Friday, I'm so sorry that I couldn't be here. ... I love you guys very much."

Selena Gomez Hospitalized

When asked about her hospitalization, she told, "I was just very malnourished, so I was low on iron and exhausted."

She sang "Who Says" and "A Year Without Rain" in front of about 500 young fans, saying, "I do feel better!"

Selena Gomez: The Billboard Cover Story

Gomez was taken to the hospital after taping "The Tonight Show With Jay Leno" last Thursday.

"She wasn't feeling well and was taken to the hospital," her rep said in a statement then. "She is currently undergoing routine tests."

#GetWellSelena became a trending topic on Twitter Friday as news broke that she was hospitalized.