Brielle Biermann is defending her mom Kim Zolciak from backlash after "The Real Housewives of Atlanta" alum posted a profane tweet about her.

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The 20-year-old reality star said on Twitter that she gave Zolciak permission to jokingly offer her up for oral sex in exchange for tickets to John Legend's upcoming concert.

"My mom is not pimping me out. That tweet was my choice," Biermann told fans in a since-deleted video on Thursday.

Zolciak was heartily criticized after tweeting to Legend's wife, Chrissy Teigen, on Wednesday. The 38-year-old television personality was seeking tickets for Kash, her 4-year-old son who is recovering from a dog bite.

"@chrissyteigen sooo ur hubby is comin to ATL may19 & Kash is beyond OBSESSED w him!" she wrote before offering Biermann up to Legend's entourage.

Teigen responded by joking Legend's concert is "not that good of a show." She said she would secure Zolciak tickets without Biermann having to follow through on her mom's offer.

"People only have a sense of humor when it benefits them," Biermann tweeted later.

Fans said Zolciak's tweet "crossed the line," calling it "unacceptable" and in "bad taste."

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The reality star shares Biermann, Kash, and four other children -- Ariana, Kroy, Jr., Kane and Kaia -- with husband Kroy Biermann.