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CHICAGO (AP) — Lady Gaga and Al Roker are among the celebrities jumping into frigid Lake Michigan waters at a fundraiser for the Special Olympics. It's the singer's second time participating in Chicago's Polar Plunge. NBC "Today" show personality Roker, Lady Gaga and her fiance, "Chicago Fire" actor Taylor Kinney, took the plunge Sunday with stars from other television shows. Chicago aldermen also participated. The event has gotten a celebrity boost recently. Last year, Vince Vaughn took the plunge. In 2014, comedian Jimmy Fallon jumped in wearing a suit and tie. The weather on Sunday was warmer than years past. The National Weather Service says the air temperature was about 40 degrees during the plunge.

Lady Gaga and Al Roker take Polar Plunge in Chicago