Kendall Jenner wows in colourful slip dress as she’s joined by leather-clad Khloe Kardashian for family dinner to celebrate the Kendall by Kylie Cosmetics line launch

The Kardashian-Jenners were out in force on Tuesday night to celebrate the new Kendall by Kylie Cosmetics line.

Kendall Jenner looked incredible in a colourful slip dress as she left a lavish dinner at Hollywood’s Osteria Mozza with her family to mark the new launch.

Older sister Khloe Kardashian chose a racy head-to-toe leather look for the big night while Kylie flashed a look at her edgy ensemble on Instagram.

Kendall looked gorgeous in her floral and butterfly print midi dress, standing out in the bright blue and purple hues.

Her model figure was on show in the tight-fitting number, while she accessorised with clear perspex heels and a bright green clutch.

Khloe meanwhile stuck to her favoured black, rocking a long leather coat over a mini dress teamed with racy thigh-high boots.

She accessorised with a zebra print bag and statement dark shades. 

Khloe was pictured leaving the bash arm in arm with her mother Kris Jenner, who looked typically chic in a black tuxedo jacket.

Earlier in the evening Kylie showed off her look as she made her way to the launch. 

The 24-year-old cosmetics mogul showed off her baggy black jumpsuit in her Instagram Stories as she prepared to depart for the event.

She was set to debut the new Kendall by Kylie Cosmetics line, inspired by her older sister Kendall.

Kylie posed in front of a mirror to share her striking look before the launch.

The jumpsuit featured baggy, rumpled legs and silver buttons over her midriff, culminating in an open olive-colored collar.

The outfit featured a thick black belt around her midriff that dangled down to her knees, and patches of vinyl were worn away to reveal the tan fabric underneath.

She elevated her 5ft6in stature with a pair of pointy black heels.

The Keeping Up With The Kardashians star had her raven locks tied back tightly in a ponytail, which showed off her chunky silver earrings.

Kylie looked as if she was playing a sport with her thick fluorescent green gloves.

‘My best friend!’ she cooed in another clip as she zoomed in on her pal Stassie Karanikolaou, who looked glamorous in a figure-hugging white top with a single long sleeve and a matching skirt.

The top was tucked into her skirt so as to leave to crescent-shaped cutouts over her hips, and she accessorized with a slim cream-colored handbag tucked under her arm that perfectly matched the ensemble.

Stassie’s makeup was also on point, and she wore her lustrous brunette locks cascading down her back and shoulder, revealing her modest silver hoop earrings.

Kylie appeared to be driving herself to the launch, and she snapped a photo of her sporty driving gloves on the steering wheel of her Lamborghini.