The 26-year-old rapper stripped off to just a tiny thong and made crude references to her genitalia during a mid-ceremony costume change.
The video was her effort to address photos circulating online of a 'wardrobe malfunction' that took place earlier on the Las Vegas red carpet.
In the red carpet photo, she kissed her husband Offset while lifting up her leg.
While she was wearing underwear in the NSFW (not safe for work) photo, trolls doctored the image to make it look like she wasn’t.
And Cardi made it clear she was not happy.
Cardi said in the video: 'Y'all motherf***ers going around showing this f***ing picture now y'all photoshopping it even more.'
She went on to deny that she revealed too much in the snap making its way around social media, and patted between her legs in an attempt to prove it.
Cardi continued by giving fans an anatomy lesson: 'This right here is where I birthed my daughter from. This right here the part when I go like this, that's just my a**. You know when you got the fat a**.'
Then she joked about her days as a stripper as she said: 'Y'all wanna look at my p**** so bad, you should have seen me when I was a motherf***ing stripper and I was promoting myself like "come see me!" Now too bad!'
Perhaps the most amusing part of the clip came toward the end when her husband was about to walk in the room before realizing she was filming a video and stopping.
The skirt boasted a high split, which meant that Cardi -whose real name is Belcalis Marlenis Almánzar- flashed photographers when her rapper husband lifted her leg while leaning in for a passionate kiss.
The tiny top also showed plenty of Cardi B's recent breast augmentation.
The Money rapper admitted to having her breasts redone through cosmetic surgery after the birth of her 9-month-old daughter Kulture during an interview with Entertainment Tonight on Wednesday.
'I just got my boobs redone,'the 26-year-old explained. 'I feel good, but then sometimes I feel like not, you know? [When] your skin is stretched out.'
'Yes, my daughter f**ked me up!' she joked. 'She did, she so did.'
She said in a video posted to Instagram last September that she was planning to go under the knife after Kulture 'did [her] bad.'
© Associated Newspapers Ltd.