Kylie Jenner is only 21 years old and already building a real estate empire — here's a tour of her luxurious homes

Kylie Jenner is 21 years old. She's also worth about $900 million.

According to Forbes, the young multimillionaire owes most of her wealth to her makeup line, Kylie Cosmetics, which is worth $800 million on its own.

But Jenner also knows how to leverage her powerful social media presence. People reported in May that Jenner, who has over 150 million followers on Facebook, Twitter, and Instagram (not including the millions she has on Snapchat), could earn up to $1 million a post.

So, what does she do with all that wealth? Invest in real estate, of course. The "Keeping Up With The Kardashians" star has owned five houses in her short lifetime, and she moved into her first when she was just 17.

After her latest real estate endeavor — a $13.45 million purchase with partner Travis Scott in Beverly Hills — it's clear that Jenner is already building a real estate empire. And if her wealth keeps increasing at the rate it has been, she's on her way toward becoming one of the youngest billionaires ever.

Here's an inside look at Jenner's real estate ventures so far.

2015: Starter house in Calabasas, California

Purchased:$2.7 million

Sold:$3.15 million

Jenner bought her first house — a 4,851-square-foot starter pad in Calabasas, California — when she was just 17 years old, in 2015. Located in the swanky Oaks neighborhood, the mini-mansion cost her a cool $2.6 million and, according to E! News, was just blocks away from the houses of sisters Kourtney Kardashian and Khloé Kardashian.

Glamour reported that Jenner completely renovated the place, decorating with her signature monochromatic color palette. "Kylie is more edgy," Kris Jenner told E! News. "She likes more blacks and grays, and Kim [Kardashian West] likes more cream colors."

According to Variety, Jenner made over half a million in profit after selling the house to entrepreneur Nikki Eslami in 2017.

2016: Hidden Hills mini-mansion

Purchased: $6.03 million

Sold: $6.7 million

While she still owned the Calabasas property, Jenner, then 18 years old, purchased a mini-mansion in Hidden Hills, California, for just over $6 million in May 2016.

The property was an upgrade in regard to size. Clocking in at just over 7,000 square feet, E! News reported that the house boasted six bedrooms, seven bathrooms, a home theater, and a four-car garage with epoxy floors.

Jenner sold the lavish property to a low-profile "apartment mogul" in 2018, according to Variety. Though it was an off-market deal, Jenner made close to a million in profit.

2016: Hidden Hills mansion next door

Purchased: $4.5 million

Sold: $5.26 million

Barely three months later in August 2016, Jenner purchased a second Hidden Hills mansion — right next door to the first.

She snagged the smaller property for $4.5 million, planning to use it as a home office while living in the first Hidden Hills mansion. The one-story residence was equipped for more than office work, though. It came with many designer perks, including a large walk-in closet and an open-air pavilion.

But Jenner quickly flipped the 5,154-square-foot house, putting it back on the market just five months later. According to Variety, she finally sold the mansion in 2017 to hockey player John Schiavo — and pocketed millions in the process.