Video: Carrie Underwood Taunts Leighton Meester

It's not just cheaters that bring out Carrie Underwood's nasty side.

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At the November 10 CMA Awards, a super-anxious Leighton Meester, 24, was prepping backstage to present an award when the 27-year-old American Idol champ, who was co-hosting the show with Brad Paisley, approached her and said, "Get out there and don't f--k it up," reveals a source. "It made Leighton more nervous."

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To find out what prompted the tough love taunt — and Underwood’s views on the cutthroat industry — watch the latest Hot Stuff video (above).

PHOTOS: Check out more celebrity feuds

Also inside the sizzling round-up, as told by Senior Editor Ian Drew: how Christina Aguilera met new beau Matthew Rutler's folks; who Eva Longoria spent the Thanksgiving holiday with; why Teen Mom's Amber Portwood was reunited with her two-year-old daughter Leah and more!

Get more Us! Follow us on Twitter | Friend us on Facebook | Subscribe to Us Weekly | For music stories and more, visit our partner site Rolling Stone | Can you match celeb A-listers to their hairdos? Play our celebrity hair game now!

This story originally appeared on UsMagazine.com

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Song Stories

“Baby Got Back”

Sir Mix-a-Lot | 1992

While watching a Budweiser commercial during the Super Bowl, Sir Mix-a-Lot thought the skinny female models in the ad didn’t represent reality. So he wrote this ode to ample bottoms, featuring its famous to-the-point lyric: “I like big butts and I cannot lie.” MTV banished the video, featuring shaking booties and sexually suggestive fruit, to 9 p.m. or later. “I thought my career was over,” he told Rolling Stone. “Then I called Rick Rubin, and I told him the video was banned, and he was like, 'Great!' We sold another 2 million records.”

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