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Kylie Jenner, Tyga, Instagram

Instagram

Wheels up to Sin City! 

Kylie Jenner was on hand to support her boyfriend Tyga's performance at Drai's nightclub in Las Vegas on Friday evening, but as a source tells E! News exclusively, she wasn't allowed in to the strictly 21 and up venue because of her age.

Instead, the insider adds the E! reality star, who recently turned 19, relaxed in the couple's hotel room while the rapper rocked the stage during a 40-minute set. Perhaps Jenner spent time bonding with her leading man's 3-year-old son King Cairo, who also flew to Vegas with them on a private jet. 

Tyga, King Cairo, Snapchat

Snapchat

The hitmaker shared photos of the toddler he co-parents with Rob Kardashian's fiancée Blac Chyna on his Snapchat, both posing on the plane and again in the hotel. 

Jenner also couldn't help but share a cozy snapshot of her ant Tyga two flying to Vegas together. It looks as if the cosmetics mogul had anticipated she wouldn't be seeing his live performance after all, as her comfy outfit of sweatpants, a sweatshirt and sneakers indicate Kylie gladly opted for a room service and movie kind of night as opposed to hitting the club.

The source tells us that after Tyga's performance, which included smash hits such as "Make It Nasty" and "Hitmaker," Tyga considered taking part in a little late-night gambling before heading up to Jenner's hotel room. 

It was truly a family affair for the Kardashian-Jenner clan last night, as Scott Disick—who was in communication with Tyga throughout the night about meeting up after his performance—had his own hosting duties at a nearby nightclub.

Just another day in the life! 

Watch a brand-new Keeping Up With the Kardashians Sunday at 9 p.m., only on E!