Ashlee Simpson has been hospitalized after collapsing Friday during an appearance for MTV Japan, a rep for the singer said Friday.

The singer is in Asia to promote her new album, I Am Me, and was the headliner of MTV Japan's Cool Christmas concert at Pacifico Yokohama. According to eyewitnesses, Simpson walked off the stage midway during her second song, the single "Boyfriend," confusing the crowd, since the band continued playing. Her band then finished the song and started playing yet another one, but still no Simpson. Finally, the singer returned to the stage, accompanied by VJ Teppei, to apologize, saying that she'd been touring a lot and was losing her voice.

Simpson later collapsed in an elevator at the channel and was taken by ambulance to a hospital. "She's still in the hospital, on an IV," her father/manager, Joe Simpson, said Friday (December 16).

The singer will miss her scheduled appearance on Monday at the Radio Music Awards in Las Vegas. A representative for NBC, which will broadcast the show, said Bo Bice would replace Simpson on the show.

[This story was originally published on 12.16.05 at 12:10 PM EST]