Vanilla Ice fully admits he used to be king of the douches, but says he knows the secret to saving Justin Bieber from the same fate.
Ice -- aka Rob Van Winkle -- came on TMZ Live to talk about Miley Cyrus saying she warned Justin about being so douchey he'd become a joke, a la Vanilla Ice.
Rob doesn't disagree with her, and even shared the formula he used to turn his life around.
Listen up, Justin ... Prof. Ice is talking.
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