Shania Twain picked up the Music Icon Award at last night’s People’s Choice Award, and proved exactly why she deserved it with a fantastic medley of her hits . . . some of which she sang in a BODY SUIT, which she ROCKED.

She’s 57 years old, by the way. Afterward, she told the crowd, quote, “When a door slams in your face, take a freaking run; just run and leap at that door and kick it down.  You won’t regret it.”