Is it Bieber fever or just a bug? Seems like teen queen Selena Gomez had a bit of the latter late last week when she was rushed to the hospital with nausea and a severe headache. The Wizards of Waverly Place star was a total pro according to those backstage at the Tonight Show, where she first fell ill Thursday. Sources tell TMZ that Gomez felt "horrible" at the taping, and she was rushed to the hospital shortly thereafter. She was in the hospital throughout the day Friday, undergoing "routine tests," her publicist said. Later, it was announced that her Friday performance at Santa Monica Place had been rescheduled for Monday. However, Gomez is still being tested for "blood pressure issues," according to TMZ. And Gomez's peeps were quick to dispel the rumors about what might be causing her illness - rumor had it that 18-year-old Gomez may be pregnant, but there's no "Baby" in there.