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It's Kylie Jenner the stepmom! Teen keeps Tyga's boy King Cairo close as they depart Costa Rica

Published: 17:13 EST, 30 January 2017 | Updated: 19:08 EST, 30 January 2017

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Many a teenager relies on babysitting for funds.

While that's certainly not the case for self-made millionairess Kylie Jenner, she still finds herself with a toddler hanging on her hip.

The 19-year-old reality star had boyfriend Tyga's son King Cairo in her charge as the extended Kardashian-Jenner clan jetted out of Costa Rica following a family vacation on Monday.

It's Kylie Jenner the stepmom! Teen keeps Tyga's boy King Cairo close as they depart Costa Rica on Monday via private jet

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Doting: It was clear that the teen makes for a very good stepmom, despite her tender age

And it was clear that the teen makes for a very good 'stepmom', despite her tender age.

As 27-year-old Tyga looked after himself, caring Kylie tended to his four-year-old, who clung to her neck with obvious familiarity.

Confusingly for the boy, as well as being his de facto stepmother, Kylie is also his auntie.

Her brother Rob Kardashian is now engaged to King's mother Blac Chyna, and fathered King's new little sister Dream.

As 27-year-old Tyga looked after himself, caring Kylie looked after his four-year-old, who clung to her neck with obvious familiarity

Royalty! Confusingly for the boy, as well as being his de facto stepmom, Kylie is also his auntie

While the family dynamic may be an unusual one, it does seem to be working out.

Indeed Chyna, who rarely has compliments for Rob's family, seems to approve of Kylie - calling her a 'huge help'.

A source told HollywoodLife.com last month: 'Kylie can't do any wrong where Chyna's concerned.

'Kylie's been a huge help to her by watching King and keeping him happy and satisfied as she deals with her two little babies who require so much of her attention, by the name of Dream and Rob.'