Christina Aguilera stopped by to visit Chelsea Handler on "Chelsea Lately" and maybe gve the host a piece of her mind. See, Handler has had plenty of fun at Aguilera's expense by making fun of the fact that Aguilera has a tendency to forgo wearing pants on "The Voice." What may seem normal when performing on stage looks a lot more unusual when she's bounding out of a chair to go hug a contestant.

So Aguilera wanted Handler to do one thing for her, as a way to apologize -- or maybe even things up a bit -- for all those pantsless jokes. And she got what she wanted. To the delight of her studio audience, Handler came out without any pants on either.

But then Aguilera upped the ante. "I don’t like to wear underwear. I like to be as free as possible at all times. It’s just who I am," she said. So for the record, that's not underwear she's running around in on "The Voice."

Catch Christina Aguilera on "The Voice," Mondays and Tuesdays at 8 p.m. ET on NBC. "Chelsea Lately" airs weeknights at 11 p.m. ET on E!

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  • Fat Betty, "Mad Men"

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  • Hibernating Max, "Happy Endings"

    <strong>What You'll Need: </strong>A bucket and/or a furry hat for your head, Wayfarers, a beard, a willingness to go shirtless (or don long underwear), an ability to grunt in a dazed and confused manner, a jar of honey. <strong>Optional Accessories:</strong> A unicycle and a trash can to root around in.

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  • "Luck's" Unluckiest Castmembers

    <strong>What You'll Need:</strong> Several friends to gallop around with and a <a href="http://www.fredflare.com/APARTMENT/Horse-Head-Mask/">creepily realistic horse mask</a> for each person <strong>Optional Accessories: </strong>A Dustin Hoffman gangster-type, horse trainers with unintelligible accents, someone with a PETA-stamped "Save The Horses" picket sign

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  • Purrfect, "The Voice"

    <strong>What You'll Need:</strong> White pants, cat years and a t-shirt with Cee Lo's face on it <strong>Optional Accessories:</strong> A sign that reads: "CAT FOR HIRE," Someone dressed like a pink cockatoo, Someone dressed like Cee Lo (with necessary sunglasses)

  • Sister Jude, "American Horror Story: Asylum"

    <strong>What You'll Need:</strong> A nun's habit, a <a href="http://www.spencersonline.com/product/al-riding-crop-black/">riding crop</a> and a good scowl. <strong>Optional Accessory: </strong>An Emmy award.

  • Dr. Rizzo, "Animal Practice"

    <strong>What You'll Need:</strong> A stethoscope, lab coat, fangs and black nail polish. <strong>Optional Accessories:</strong> Excessive facial/body hair, a banana, an actual doctor to perch on the shoulder of.

  • One-Night Stand Doctor, "The Mindy Project"

    <strong>What You'll Need: </strong>A sequined short dress (ideally in a jewel tone), a white doctor's coat and a stethoscope <strong>Optional Accessories:</strong> A doctor's bag with some stilettos and a condom, A male nurse with some messy hair

  • Ron Swanson At A BBQ, "Parks & Recreation"

    <strong>What you'll need:</strong> Fake mustache, masculine-themed cooking apron, meat smoker attached to your car, toy pig. <strong>Optional accessory:</strong> Bacon to hand out to trick-or-treaters.

  • The Dowager Countess, "Downton Abbey"

    <strong>What You'll Need: </strong>A hat, cane, corset, floor-length gown and stern expression. <strong>Optional Accessories:</strong> Maids, a cup of tea.