Just the tonic! Kylie Jenner embarks on juice cleanse ahead of her 19th birthday

She hasn't trod catwalks nearly as often as her elder sister Kendall Jenner.

But Kylie Jenner hinted that her occasional forays into modelling have still drummed a few habits into her.

In a Snapchat post on Sunday, she held a bottle of brownish juice for her 'pre-birthday cleanse' ahead of this coming Wednesday, when she will turn 19.

'Pre-birthday cleanse': On Sunday, Kylie Jenner uploaded a Snapchat post showing one of the juices she will be using in her bid to slim down ahead of her birthday

'Pre-birthday cleanse': On Sunday, Kylie Jenner uploaded a Snapchat post showing one of the juices she will be using in her bid to slim down ahead of her birthday

Past the milestone: The Keeping Up With The Kardashians star will turn 19 this coming Wednesday

The same day, she uploaded an Instagram photo of the lipsticks in her gold-themed makeup line, The Limited Edition Birthday Collection. The line, which goes back on sale Monday, includes the artfully named 'Kyliner.'

Her current slimming campaign is merely the latest in a string of preparatory events for Kris Jenner's youngest daughter. 

On Saturday, she uploaded a snap of herself and her rapper boyfriend Tyga playing with multicoloured 'magic sand,' pouring it in water and then lifting it out to reveal it had instantly dried. 

Constant hustle: The same day, she made sure to swing by Instagram and promote her makeup line, The Limited Edition Birthday Collection, which goes back on sale Monday

Constant hustle: The same day, she made sure to swing by Instagram and promote her makeup line, The Limited Edition Birthday Collection, which goes back on sale Monday

Doting: On Saturday, the sometime model and her boyfriend Tyga (right) went to the cinema in the Maybach-Mercedes he had given her as an early birthday present

Doting: On Saturday, the sometime model and her boyfriend Tyga (right) went to the cinema in the Maybach-Mercedes he had given her as an early birthday present

The colour of reality TV royalty: In a Saturday night snap, Kris Jenner's youngest daughter revealed her car lights up purple on the inside

The colour of reality TV royalty: In a Saturday night snap, Kris Jenner's youngest daughter revealed her car lights up purple on the inside

Earlier, he had surprised her with a particularly luxurious early birthday gift: a gleaming blue Maybach-Mercedes. 

Saturday evening, Caitlyn Jenner's daughter posted a Snapchat video revealing that the car's interior lit up purple.

Inasmuch as added specifications to the car can drive the cost up, the royal glow may have set her beau back even more than the basic model's price of $190,000.

Swank: The most basic model of the car costs $190,000, though specifications can raise the price

Swank: The most basic model of the car costs $190,000, though specifications can raise the price

How the 26-year-old rustled up the money for his girlfriend's lavish present, particularly as reports swirl of his financial troubles, is unconfirmed. Moreover, where luxury cars are concerned, the Ayo performer's reach frequently exceeds his grasp.

For Jenner's 18th birthday last August, he gave her a Ferrari - only for it to emerge he had actually leased it in her name because he lacked the funds to pay for it himself.

This April, TMZ reported that Choice Motor Credit intended to seize Tyga's own Lamborghini after he neglected to make the necessary payments. The company had already reclaimed and resold his Bentley Mulsanne in February.

Strapped: The last time the rapper gave his girlfriend a car for her birthday, it emerged he had simply leased it in her name because he could not afford it himself

Strapped: The last time the rapper gave his girlfriend a car for her birthday, it emerged he had simply leased it in her name because he could not afford it himself