Kylie Jenner was feeling sassy and unbothered Saturday night … giving the paparazzi a little attitude as she rolled up to her mom Kris Jenner‘s star-studded 70th birthday party.

The makeup mogul was photographed arriving at Jeff Bezos and Lauren Sánchez‘s $165 million estate where the party was underway, and she made quite the entrance … flashing a middle finger to waiting photographers from inside her car.

But don’t get it twisted … Kylie wasn’t in a bad mood. If anything, she was feeling playful and full of that classic Kardashian-Jenner confidence. Dressed to kill for the affair, Kylie looked glowing as she joined hundreds of A-listers celebrating her mom.

The guest list was major Hollywood power … Oprah Winfrey, Adele, Mariah Carey, Tyler Perry, Meghan Markle and Prince Harry, and even Bruno Mars, who sources tell TMZ performed at the bash.