In the newest “OMG”, we get behind some of Hollywood’s newest reveals: How is Mary-Kate’s history with Spencer Pratt turning into a present-day catfight? Just how many guys did Pete Wentz kiss? Will the long-lost Lohan sister become a musical threat? Plus, steamy news on Will Smith’s hot workout plan and Harry Potter’s R-rated twist. And new music from Carrie Underwood, the Jonas Brothers, and Christina Milian!

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