Jon and Kate Gosselin's sextuplets turn 13: See what they look like now!

The Gosselin sextuplets are finally teenagers!

The six kids -- Aaden Gosselin, Alexis Gosselin, Collin Gosselin, Hannah Gosselin, Joel Gosselin and Leah Gosselin -- turned 13 on Wednesday, and four of them celebrated with their father, Jon.

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"I had four of them: Hannah, Leah, Joel and Aaden," he told E! News. "I cooked burgers and hot dogs on the grill, and we did presents and played football in the backyard. After that, we did cake and ice cream."

Clearly Jon and the kids had a great day together. The reality-star-turned-DJ sees his kids once a week for dinner, as well as every other weekend. Kate has custody of the sextuplets -- and twins Cara and Mady, 16 -- at all other times. The "Kate Plus 8" star commemorated his children's big day with a series of emotional Instagram posts.

See photos of Kate Gosselin through the years:

"Sitting in my room with the kids... thinking back to almost 13 years ago," she captioned a photo of a diaper. "I pulled out this extra small preemie diaper from the NICU.. I've kept it in my bedside table drawer, wherever we always remind me of how far we've come!! The kids were awed!"

In another post that featured a collage, Kate got even more emotional.

"HAPPY 13th BIRTHDAY, my precious Alexis, Hannah, Aaden, Collin, Leah and Joel," she wrote. "At this moment (7:51-7:53 am) 13 years ago, my life and heart were completed with your births! I love you all and NO MATTER WHAT it requires of me, I will ALWAYS be there for you; I'll always be your biggest cheerleader, your role model by example, your shoulder to cry on, the hug and laugh you need, and your mommy and friend! I love you guys! I got six times what I planned on, but I'd NEVER EVER go back! You're the six final pieces of my heart that I never knew I was looking for."

Finally, she shared with her followers the fun -- and delicious -- breakfast she prepared for her kids to honor their big birthday: Sticky buns!

"13th birthday school treat gone wild," she captioned the drool-worthy photo. "Apparently I don't know how to make a 'little' of anything!"

Gosselin had also recently shared a photo of her entire family together, and they're all so grown up and adorable. Can you believe they're 13?!

Happy birthday to the Gosselin sextuplets!

See photos of Jon Gosselin through the years:

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