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The Tonight Show, Selena Gomez

Paul Drinkwater/NBC

Oh no!

While it's unclear as yet what caused it, E! News has confirmed that pop princess Selena Gomez was rushed to the hospital last night, immediately after her appearance on The Tonight Show.

Ever the consummate pro, she never let on during the interview—in which she discussed Justin Bieber passing the mom test and laughed it up with Jim Carrey—that she was feeling nauseous and suffering from a severe headache during her appearance. So what's wrong?

"Last night after Selena's appearance on The Tonight Show, she wasn't feeling well and was taken to the hospital," her rep told E! News. "She is currently undergoing routine tests."

Gomez was expected to perform several songs at the Santa Monica Place mall later this afternoon, but has already scrapped those plans while she recovers. It's unclear if she'll reschedule the mini concert.

Meanwhile, the Biebs has already sent some get well wishes her way, tweeting out, "#getwellselena" this afternoon.

Our sentiments exactly. Feel better, Selena!

—Reporting by Ken Baker

(Originally published on June 10, 2011 at 11:07 a.m. PT)