In demand models Karlie Kloss and Barbara Palvin stepped out in plunging black dresses to the launch of the De Grisogono 'Crazy Skull' watch in Paris.

The statuesque blondes left little to the imagination in their daring formal dresses online which they wore to the glamorous event on Thursday.

Barbara, 21, and Karlie, 22, were the centre of attention in their slashed formal dresses.

Karlie showcased her long lean dancer's body in her black formal dresses which was split to the navel.

The fashion model, who studied ballet as a child, added extra height to her towering frame with a pair of black eye heels.

As well as a pair of stunning diamond drop earrings, Karlie flashed the watch of the night on her slender wrist.

The timepiece which took more than 250 hours to create is a black and white diamond skull which displays the time in its eyes.

Karlie swept her blonde hair in tousled waves to one side and opted for blue eyeliner to accentuate her grey eyes.

Meanwhile, her catwalk colleague Barbara looked equally dazzling in a plunging vintage formal dresses cinched tightly at the waist with a black leather band.

The 21-year-old Hungarian model slicked her long blonde hair back off her face drawing attention to her sparkling diamond earrings.

Victoria's secret angel that diamond bracelet on her left hand, put a bag.

And Barbara in 2012 with the singer Justin bieber emphasized the natural beauty of her choice of smoke look, just a little lip gloss.

The towering beauties were also joined at the event by Laeticia and her husband Johnny Hallyday.

De Grisogono is a favourite of celebrities including Cheryl Fernandez-Versini who designed a collection with them in 2010.