American actress, singer, and entrepreneur Selena Gomez has been admitted to a hospital following an appearance on The Tonight Show with Jay Leno.Gomez "wasn't feeling well and was taken to the hospital" and is undergoing "routine tests." The 18-year-old singer-actress was promoting the upcoming film Monte Carlo on the talk show. Gomez's appearance to promote the film at a Santa Monica, California, mall on Friday was canceled.The hospitalisation was first reported by TMZ, which said Gomez suffered from nausea and a headache before going to a Los Angeles-area hospital.
