Selena Gomez Hospitalized With Nausea & Severe Headache?

Selena Gomez was looking good last night on The Tonight Show With Jay Leno, but apparently she wasn't feeling so good. Justin Bieber's girlfriend was reportedly taken to the hospital after her appearance.

OK! VIDEO: SELENA GOMEZ TELLS JAY LENO BOYFRIEND JUSTIN BIEBER "PASSED THE TEST" WITH HER MOTHER

According to TMZ, Selena was rushed to the hospital last night right after she finished chatting with Jay Leno.

TMZ sources report that Selena was complaining of nausea and a severe headache during and after the show.

OK! GALLERY: JUSTIN BIEBER BRINGS SELENA GOMEZ (& HIS BODYGUARD) ON A DATE TO THE NBA FINALS!

Selena was taken to a hospital in L.A. and is reportedly still there undergoing tests.

The cause of her illness is not yet known, but we wouldn't be surprised if baby rumors start up since "nausea" is one of her reported symptoms!

We hope The Biebs' girlfriend feels better soon.