Watch If/Then's Idina Menzel Sing Joni Mitchell & Talk Wicked Witches Going Commando by Imogen Lloyd Webber

Last time Frozen star Idina Menzel stopped by The Tonight Show she "Let It Go" and went viral; on December 15 the Tony winner was granting all our Holiday Wishes, soulfully singing Joni Mitchell's "River" from her latest album. The If/Then headliner also revealed one of her favorite holiday traditions, which features a reminder of her Tony-winning turn in Wicked that involves wearing…

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