They grow up so fast!

Khloé Kardashian admitted that she’s having trouble accepting the fact that her and Tristan Thompson’s daughter, True Thompson, is already starting kindergarten.

“????????Kindergarten ????????,” the reality star, 39, captioned a series of pictures via Instagram Tuesday. “For anyone wondering, no I’m not ok! Next it will be prom ????????.”

Kardashian shared several sweet snaps of her 5-year-old posing in front of a tall backdrop in the shape of a loose-leaf sheet of paper with “First Day of Kindergarten” written on it.

The “Kardashians” star outlined the backdrop with a pastel yellow, blue and purple balloon arch featuring blown-up pencils attached to it.

While her mom was “not OK,” True – chic in a plaid skirt and collared shirt – looked as confident as ever in the sweet snaps. At one point, she adorably posed with her hand on her hip, showing off her sassy side.

The Good American co-founder hopped in a few of the pics and had her daughter sit on her knee as they looked at both the camera and at each other.

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Notably, True didn’t have any sort of cast on her arm despite breaking her arm earlier month.

Meanwhile, Kardashian kept her look casual in a black zip-up sweatshirt, black leggings and white and yellow sneakers.

It’s unclear if Thompson, 32, was present for the memorable occasion. He did not post anything to his own social media accounts and wasn’t featured in any of Kardashian’s snaps.

Kardashian and the Los Angeles Lakers player are also parents to son Tatum, 1. The exes celebrated the little one’s first birthday milestone with a lavish space-themed party.