December 16, 2005 12:00 PM

Ashlee Simpson has been hospitalized in Japan after collapsing from exhaustion, her rep Rob Shuter confirms to PEOPLE.

Simpson, 21, is currently in Tokyo to promote her sophomore album I Am Me, which debuted at No. 1 on the Billboard Album chart in October. She collapsed Thursday following a performance on MTV Japan and was taken to an area hospital by ambulance.

For the past two months, Simpson has been doing appearances in support of I Am Me for various radio stations and TV shows, including Saturday Night Live, where in 2004 her aborted lip-synch performance caused a media firestorm.

Simpson told PEOPLE last month, “Everything I’ve gone through this year – whether it be a breakup, or SNL, finding myself – I feel like I faced a dark side and a light side and that’s okay.”

Simpson had been scheduled to perform at the Radio Music Awards in Las Vegas on Monday.

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