Pregnant Kylie Jenner hides her bump before displaying remarkably flat midriff for latest fashion campaign with sister Kendall (Details, pics)

Fans have been heavily speculating that she has given birth to her first child after they noticed her absence from the Kardashian family's Christmas card.

And adding fuel to the fire, Kylie Jenner, 20, has now showcased her hourglass curves in a new campaign alongside her supermodel sister Kendall, 22, for their latest footwear collection with Forever Unique.

The make-up mogul smoldered for the camera in an array of sultry looks for the highly-anticipated KENDALL + KYLIE SS18 line with the luxury ladies fashion brand ahead of Forever Unique's 10th Anniversary later this year.

In the new campaign shots, Kylie slipped into a slinky corseted black slip dress with spaghetti straps which showcased her flat stomach and a hint of leg, displaying no sign of a baby bump.

Although it is not known when exactly the campaign was shot, the Life of Kylie star's choice of ensemble accentuated her ample cleavage while also drawing attention to a decidedly smooth midriff.

In another photo, the Californian beauty highlighted her waist in an orange camouflage body which she teamed with a pair of black on-trend joggers as her long brunette locks cascaded down her back in a straight style.

Then in another stomach-flaunting shot Kylie sported a white corseted-style T-shirt with a pair of low-slung denim jeans which highlighted a taut midriff while wrapped up in a red padded jacket.

Leaving tongues-wagging, fans of the stars can be expect their sisters new Spring Summer offering to be filled with feminine styles, including metallic court shoes, barely-there illusion heels and pointed stilettos as well as off-duty designs.

Meanwhile, it was first reported in September that Kylie was five months pregnant and expecting a baby girl, according to TMZ.

The reality star - who is yet to publicly state herself that she is pregnant - but is said to be welcoming a daughter with the 25-year-old rapper, Travis Scott who she is thought to have begun dating around April 2017.