Last night's show could not go on for Lady Gaga -- the star had to cancel her West Lafayette, IN performance on the Monster Ball Tour because she had collapsed earlier that day. Paramedics rushed to the scene and found that her heart-rate was irregular as a result of exhaustion and dehydration.

Even though she wanted to take to the stage, Lady Gaga was having trouble breathing and feeling dizzy right before the show so was forced to cancel. "I feel like I let my fans down 2nite," she Tweeted. "Can't apologize enough for how sorry I am. I hope you can forgive me." Lady Gaga plans to do a makeup performance for her West Lafayette fans on January 26.

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Popeater: Lady Gaga Cancels Indiana Show at Last Minute

Photo: Courtesy of Interscope