They've had a complicated dating history featuring denials, break-ups and his ex getting engaged to her sibling.

But Kylie Jenner could be the latest one to get engaged- to on-off beau Tyga, if her recent Instagram snap is anything to go by.

The 18-year-old reality star took to the social network on Friday to share a picture as she leaned into a car window, reaching towards the camera and showing off a huge diamond on her ring finger.Her manicured left hand clearly in focus, she boasts a huge pear shaped cushion-cut diamond ring on her wedding finger.

Though she has not captioned the snap, her blissful expression suggests she's clearly pleased about something.

Sporting a loose white jumper, her trademark coloured raven tresses and famously enhanced pout, the teen smiles at the camera behind round reflective sunglasses. 

Notably 26-year-old rapper Tyga was spotted leaving high end jewellery store Polacheck's Jewelers in Calabasas on Thursday- just one day before Kylie posted the telling snap.

Looking casual in a black t-shirt and beige shorts, the bling-loving Rap City star carried a black gift bag following his shopping trip.

Later that day Kylie posted a loved-up snap of the twosome cosying up at a Pretty Little Things party- her ring finger still bare, adding the revealing caption: 'Mr and Mrs'.

However she mysteriously deleted the picture moments later.

The youngest of the Kardashian-Jenner clan, famed for her ever-growing lips and curves, confirmed her rekindled romance with father-of-one Tyga this week, sharing a picture of the duo cosying up during 4th of July celebrations.