There were lots of celebs in Chicago for the Polar Plunge on Sunday: actors from  “Chicago Fire,” “Chicago PD,” and “Chicago Med” took the plunge into Lake Michigan. “Chicago Fire” star Taylor Kinney was joined for the second year in a row by his fiancée Lady Gaga – they even repeated a piggyback exit from the water.  The Today Show’s Al Roker also joined in the fun for a good cause MORE