Teen queen Selena Gomez, the main squeeze of Justin Bieber, was rushed to the hospital last night after her appearance on 'The Tonight Show.' Let's hope it was just Jay Leno's jokes that made her sick and not something more serious!

TMZ reports that Gomez, 18, was feeling horrible during and after the show, complaining of nausea and a severe headache. Ugh -- that doesn't sound like fun, especially when you feel that way on live, national TV, with millions of your fans and average Americans watching you.

After her appearance, Gomez was transported to a hospital in Los Angeles, where she is reportedly still undergoing tests as of press time.

The exact cause and nature of her illness is unknown, as details are a bit scarce. PopCrush extends a hearty "Get Well Soon" to the lovely and talented Miss Gomez, and we hope she's back to her old self in no time.

We're curious as to whether or not Boy Wonder Bieber, whom Gomez admitted is approved of by her mom, has rushed to his lady love's side in this her hour of need?

Shockingly, Jennifer Hudson found herself in an identical situation following her 'GMA' performance on June 10. She too was hospitalized, and in turn had to cancel her scheduled CBS ‘Early Show’ appearance.

Watch the Selena Gomez and the Scene 'Who Says' Video