Kim poured her figure into skintight denims

Jessica Simpson famously proved high-waisted jeans can be incredibly unflattering on a curvy figure.

But Kim Kardashian decided to rewrite the rules during a promotional appearance in Sherman Oaks, California, yesterday.

The shapely reality TV star poured her figure into skintight denims with sailor-style brass buttons that came right up her midriff.

Curves a go go: The star proudly put her shape on show in super tight high-waisted denims. To the surprise of onlookers, she miraculously managed to pull off the 'mom jeans' look with aplomb.

She was joined at the event by her sister Khloe, 25, who at 5ft 10in towered over her 5ft 2in sibling.

Anything for a crust: Both sisters swear by the slimming product whose side effects include insomnia, diarrhoea, irregular heartbeat, dizziness, vomiting
Simpson

Mom jeans: Jessica Simpson proved last year that the high-waisted look can be difficult to pull off

Of course, both girls were given a boost in the height department by killer stilettos, with Kim's pair sporting an unusual cloven heel design.

The celebrity sisters were plugging QuickTrim slimming product at a local Rite Aid pharmacy.

Tweeting her thanks to her many fans and followers, Kim wrote, 'Thanks dolls for coming out to visit us on our QuickTrim appearances!'

Khloe chimed: 'Thank you dolls for coming to Sherman Oaks! I love you guys!'

Both girls endorse the product, which they credit for helping them slim down.

However, the product has has not been given the seal of approval by the USA's Food and Drug Administration which rubber-stamps the safety of such products.

The diet system makes a wealth of claims and says it will 'rid the body of excess water weight, belly bloating and intestinal bulk.'

Side effects of the product include insomnia, diarrhoea, irregular heartbeat, dizziness, vomiting, headache, loss of appetite, raised blood pressure and increased heart rate.