Pop star Lady Gaga has canceled four of her US concerts, citing exhaustion and dehydration. The Grammy-nominated singer, one of the top-selling artists of the last two years with hits like “Bad Romance” and “Poker Face”, pulled out of a show in Indiana on Thursday and on Friday postponed or canceled shows on Jan 16-18 in Connecticut and Atlantic City. “I've been crying for hours, I feel like I let my fans down 2nite,” the 23 year-old singer wrote on social messaging site Twitter on Thursday. “An hour before the (Indiana) show, I was feeling dizzy and having trouble breathing. “Paramedics came to take care of me, and told me my heart-rate was irregular - a result of exhaustion and dehydration.” “I am so devastated. I have performed with the flu, a cold, strep throat: I would never cancel a show just based on discomfort,” she added. In a prerecorded appearance on “The Oprah Winfrey Show”, broadcast on Friday, Gaga spoke of the demands of her Monster Ball tour.
