Selena Gomez Selena Gomez

Selena Gomez was hospitalized Thursday night in Los Angeles following an appearance on The Tonight Show with Jay Leno.

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"Last night after Selena's appearance on The Tonight Show, she wasn't feeling well and was taken to the hospital," her rep said in a statement. "She is currently undergoing routine tests."Gomez, 18, was complaining of nausea and a severe headache, according to TMZ.The actress was on The Tonight Show to promote her new movie, Monte Carlo, which opens July 1.