Kelly Clarkson has claimed an ex-manager once urged her to get a boob job.

The Since U Been Gone singer blasted her ex-manager during her Studio Sessions residency show in Las Vegas over the weekend after reading a note on the teleprompter informing her to "fix boobs".

After adjusting her sparkly jumpsuit, Kelly launched into a personal story about refusing to undergo a breast enlargement procedure.

"I'm just gonna say it. I had some d**k manager one time tell me to get a boob job," she told the audience. "I was like, 'Why don't you get a d**k job? I'm fine with my itty-bitty t**ties! Get out of here!'"

The Kelly Clarkson Show host then reflected on how normalised body-shaming is for women working in the entertainment industry.

"Who says that s**t?" Clarkson continued. "People say that s**t. They say it all the time to people in the industry. They say the craziest s**t. I'm like, 'This is not normal. You've normalised crazy.'"

The 43-year-old also joked that so many public figures are getting cosmetic procedures that they're looking like the people who live in The Capitol in The Hunger Games book and film series. The Capitol is an affluent city where rich people have the resources to wear outlandish clothes and modify their bodies.

Concluding her story, Clarkson declared, "Do you - but don't make me do you. I like my itty-bitty t**ties. They've served me well."

The weekend's performances marked the singer's return to her residency after postponing her August shows to be "fully present" for her two children while her ex-husband, Brandon Blackstock, was ill. He died of melanoma the following day at the age of 48.

The Studio Sessions residency, which is held at the Colosseum at Caesars Palace, concludes on Sunday.