Katharine McPhee's little back dress is so disgustingly short, she can't help but flash her underwear during her performance of "Love Story" on the Tonight Show with Jay Leno.  Does she think she's Britney Spears?  The flashing begins mid-way through the video. Sorry you'll have to suffer just like I did to see it unless you scroll mid-way thru when she starts jumping up and down.
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