Vince Vaughn and Lady Gaga participate in Polar Bear Plunge

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CHICAGO — A variety of stars and high-profile figures were on hand in Chicago Sunday for the annual polar plunge.

They were just a few of the 45,000 people committed to diving into the icy waters of Lake Michigan.

They may be crazy, but it’s all for a good cause. They’re raising money for the Special Olympics.

Actor Vince Vaughn was one of the many who particpated. Pop star Lady Gaga and her fiance Taylor Kinney also participated.