She later added a photo of the interior, and captioned it, "Almost too boss for me."
Jenner also shared several videos from earlier in the day, which showed her being surprised by her beau.
"Hey, happy birthday," Tyga said, as the two look at the car which is parked in a driveway. The soon-to-be birthday girl responded in near-disbelief.
"Stop! T!" she said, checking out the car as Tyga starts singing "Happy birthday to you!"
"T!" Jenner said in the video. "What is happening? Oh my goodness. This is so cool."
But this isn't the first set of car keys Tyga has gifted Jenner. Last year, he surprised her with a white convertible Ferrari 482 Italia (with a price tag of a cool $320,000) for her 18th birthday.
Last Wednesday, the rapper told Hollywood Today Live that he had a slightly difficult time deciding what to give Jenner for her 19th birthday.
"She might be watching, so I can't [say]," he said, when asked about his gift. "It's really just about what you feel. How do you get someone that has everything, you know?"
This isn't the first early birthday present Jenner has received – she was also given a puppy (which she named Penny) by her friends last weekend.