The pop star and her TV star fiancé took part in the Chicago Polar Plunge on Sunday

Lady Gaga Takes the Plunge with Taylor Kinney – but It's Not What You Think

It’s so cold not even Lady Gaga can help heat things up!

The pop star (and Julie Andrews’s new friend) showed up at Lake Michigan on Sunday to participate in the Chicago Polar Plunge, an event to raise money for the local chapter of the Special Olympics.

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Gaga – fresh off her extraordinary performance of “The Sound of Music” at last Sunday’s Oscars – entered the frigid waters on the shoulders of her fiancé Taylor Kinney, who was also taking part in the event.

She wasn’t the only celebrity to take the plunge – four of Kinney’s Chicago Fire co-stars (David Eigenberg, Randy Flagler, Jon Seda and Brian Geraghty) took the plunge as well. So did Vince Vaughn, who agreed to serve as the guest of honor after a successful social media campaign began on Twitter with the hashtag #VinnyDippin.