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Khlo Kardashian "loves the changes" she's seeing to her body of late.

The reality TV star has stepped out in a range of figure-hugging red dresses over the past few weeks, showing off her new slim-line frame.

Insiders close to the star say Khlo is working hard to achieve her toned physique, and is pleased with the impressive results.

"Her weight goes up and down, so instead of just dieting, she's building herself a really muscular body. Khlo's signed up with Gunnar Peterson, who trains sister Kim. He makes her do squats and lunges to tone her thighs," a source told British magazine Heat.

"She loves the changes she's seeing."

Khlo is famed for being outspoken, and took to Twitter last week to blast people who judge others by their size.

"Still get disgusted by how people judge others by weight. Either 'fat' or 'skinny'. Nothing is ever good enough... (sic)," she posted. "Throwing stones behind a screen. If you must judge a person. Try judging their soul. My brick walls are getting higher and higher."

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