Selena Gomez Hospitalized

Singer/actress is 'undergoing routine tests' after being admitted to the hospital following a 'Tonight Show' appearance.

Shortly after taping an appearance on "The Tonight Show With Jay Leno" on Thursday, Selena Gomez was taken to the hospital, MTV News has confirmed.

"Last night after Selena's appearance on 'The Tonight Show,' she wasn't feeling well and was taken to the hospital," Gomez's rep said in a statement to MTV News. "She is currently undergoing routine tests."

The news was first reported by TMZ, which said the singer/actress had been suffering from nausea and a headache before going to a Los Angeles-area hospital. Further information about her illness is unknown.

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During her interview, which aired Thursday night, Gomez, wearing a little maroon dress, opened up about growing up with a single mom. "She was a chameleon, my mom, because she was a single mom," she said. "She basically raised me and had to work a lot of jobs. She did a lot of theater, though; she never did television. I loved watching my mom."

Does her mom approve of beau Justin Bieber? "Yes [she met Justin]. He passed the test," she said, giggling. Other hot topics included appearing on the covers of magazines, getting her driver's license, getting into a fender bender and her love of fellow guest Jim Carrey's movies.

Gomez was on the show to promote her new flick "Monte Carlo." She's also set to release an album this year. People reports that the singer's appearance in Santa Monica on Friday has been canceled.