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Demi Lovato, Twit Pic

Twitter

Is that you, Demi Lovato?!

During a recent concert, the 21-year-old "Skyscraper" singer went undercover and dressed in a funny costume inspired by Justin Timberlake and Andy Samberg's infamous Saturday Night Live music video "D--k in a Box."

Lovato was unrecognizable when she crashed the stage wearing a short dark wig, sunglasses, a fake mustache and a suit with a giant gift-wrapped box attached to her crotch. During the stunt, Lovato surprised fans and her tourmate Collins Key, who was also on stage during the hilarious bit.

Lovato shared a funny backstage photo of her getup on Twitter with the caption, "#whatsinthebox @CollinsKey."

Key wrote back, "#WhatsInTheBox ;)."

Lovato also shared a funny video of herself mocking the "D--k in a Box" video and busting a little dance move with the package attached to her groin.

Lovato has been enjoying her pranks lately. She also shared a Keek video in which she attacks pals with silly string backstage during one show. "Where's Steve??! #tourpranks," she captioned the funny video.