Jon Gosselin 'can’t believe' kids are starting high school, shares first day photos

Jon Gosselin shared photos of kids Hannah and Collin before they begin high school.
Jon Gosselin shared photos of kids Hannah and Collin before they begin high school.

Jon Gosselin's kids are all grown up and he can't believe it.

Neither can we!

The former "Jon & Kate Plus 8" star, 42, took to Instagram Monday to share photos of Hannah and Collin, both 15, on their first day of high school.

"FRESHMAN!!! 9th Grade Wow!!! I can’t believe it!!! Good luck to Hannah and Collin this year!!!" he captioned the photos. "Today is their first day of high school!!!! I hope all my kids have a wonderful year in high school this year and have great experiences!!! Love all of you!!!"

Hannah and Collin are two of Gosselin's sextuplets that he shares with ex-wife Kate Gosselin. They also share 18-year-old twins Cara and Madelyn.

According to E! News and People, Hannah and Collin live with their dad while the rest of the children live with mom Kate.

Kate shared a similarly proud photo of the other children before school started last year.

"This was yesterday! Feels like school never ended...and they’re already back!" she captioned the photo at the time.

The Gosselin family rose to fame on the TLC reality TV show "Jon & Kate Plus 8," which premiered in 2007. The series was later named "Kate Plus 8" in 2010, following the Gosselins' 2009 divorce.

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This article originally appeared on USA TODAY: Jon Gosselin 'can’t believe' kids Hannah, Collin are high schoolers