Instagram/Jon GosselinThey grow up so quickly, don't they?
On Monday morning, Jon Gosselin celebrated son Collin Gosselin and daughter Hannah Gosselin's first day of school by sharing snaps of his kids posing on the front steps of their home. For the big day, Hannah chose a denim skirt, gray top and sneakers while Collin looked casual in a black tee and jeans. Honestly though, we just can't get over how grown up they are.
"FRESHMAN!!! 9th Grade Wow!!!" the Jon & Kate Plus 8 alum captioned his Instagram post. "I can't believe it!!! Good luck to Hannah and Collin this year!!! 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!!!"
If you're wondering where the remaining sextuplet siblings are, well, they live with mom Kate Gosselin. As for twins Mady Gosselin and Cara Gosselin, they're now off to college. Last year, Jon was awarded temporary sole legal and physical custody of Collin while Hannah permanently lives with her dad.
"Hannah is excited that her brother is coming home," Jon told E! News at the time. "The other four [sextuplets] aren't talking to me, but they're talking to Hannah. It's what the kids want to do. If they don't want to talk to me, that's fine, as long as they keep up with their sibling connections."
Ever the proud dad, Jon often takes to social media to honors his kids' milestones. In May, he paid tribute to his sextuplets on their birthday with the sweetest message.
"Happy 15th Birthday Hannah, Collin, Alexis, Aaden, Joel and Leah!!!!" wrote to his 100,000 followers. "Wow I can't believe you are 15!!! Time is flying by!!! I love you all very much. I wish you the best day ever and I hope you enjoy your birthday celebrations today and this weekend!!! Love always, Dad."
And, this time last year, he sent Hannah off to school with another celebratory Instagram post. "I admire your bravery starting fresh!!!" he shared. "I Love you very much and we have worked really hard to get here. Dedication has really paid off."
Of course, he's not the only celeb parent gushing over his kids. Keep scrolling to see all the adorable back to school photos!
The comedian's youngsters were all off to school.
"First day of school for my gorgeous girls! Yeah...I came up with an embarrassing cheer this morning laying in bed and couldn't wait to sing it for them. The good news is...I did not do this in front of their classmates!" the actress wrote online.
"JUST DROPPED OFF MY LIL ONE ON HER FIRST DAY OF SCHOOL," the performer captioned an adorable photo of himself with his daughter, Kensli.
"1st day of school. How did this happen?!?! I actually didn't cry, is that crazy?! He started something called PORTABLE CLASSROOM two days a week. It's essentially a toddler transition class," the MTV star and Sonny's mama explained on social media.
"And just like that, I can walk around target alone," the former Bachelorette captioned an adorable shot of her three boys.
The Jersey Shore star revealed her 5-year-old daughter wanted to pick out her own outfit.
Jana's husband Mike Caussin gets an A for effort? "I was hoping for the shot outside the front door with a really cute sign (which I told him to please do)," she captions the shot of daughter Jolie. "And I truly would have LOVED her hair brushed but I guess this will have to do...(she obviously is still adorable but #men)."
"Second grade has begun for the kid," the actress says of her son, Arthur. "I remember feeling nostalgic for first grade when I entered Mrs. Herman's second grade. Mrs Weisman was so strong and loving. I had so many wonderful teachers in my life. I am so pleased he was enamored of his teachers today. Makes all the difference. Thank you to all the teachers, so many thanks."
Sebastian Taylor Thomaz is ready for second grade!
Bon voyage! Lola Consuelos gets some extra love from her famous mama before heading off to college.
The Fixer Upper star snaps a photo of Taylor and Brayden El Moussa before they start third grade and preschool.
Rocky and Charlotte are gearing up for first and fourth grade! "There are no perfect parents, and no perfect kids," muses the actress, "but there are perfect moments."
"New chapter begins for Sascha," the Seinfeld family matriarch writes on social media. "Off to college! So many warm wishes and goodbye's sent our way from friends and family this morning before we left. Thank you! We feel tremendous gratitude for each and all."
"2nd grade what's up" the Lizze McGuire star captions a shot of son Luca.
Where does the time go? The rapper is "so proud" of 5-year-old daughter Royalty as she kicks off her first day.
The actor's daughter Harper seems a bit skeptical about school.
"FRESHMAN!!!" the proud dad gushes of his kids Collin Gosselin and Hannah Gosselin, who are starting high school.
The Oscar winner drops her eldest son Maddox off at school at Yonsei University.
"Caiden's first day at school!" the mother of two writes on Instagram. "I'm so glad we did summer school prior to fall.. Just in those few weeks he grew and learned so much. Today's drop off was easy peasy!"
"How do I have a 6th grader??" the proud mama captions a photo of her daughters Maddie and Ivey.
"We are coming for you 2nd grade," The Real Housewives of Dallas star writes alongside a photo of her son Cruz. "Happy first day of school @cruz.hollman—keep shining sweet boy."
"These kiddos are getting so big, so fast!" the Teen Mom star writes alongside a photo of her son Kaiser on his first day of kindergarten. She also shares a photo of Maryssa, who is starting seventh grade.
"Class President 2032," The Bachelorette alumna captions a photo of daughter Addison. "My angel bunny girl started kindergarten today. She said it was 'the best day ever!' Shine on Tiny Pants...I'm so proud of our little girl!"
"And they're off... first day of school!" The Real Housewives of Orange County star writes alongside photos of her three kids: Nicholas, Sienna and Luca. "Wishing all the kiddos out there a great school year."
The Real Housewives of Atlanta star's son, Ace Wells Tucker, is starting pre-school.
The Bachelorette couple's kids—Fordham and Essex—are ready for a new year!
"First day of 3rd and Kinder...." The Bachelorette star writes on Instagram alongside a photo of kids Beckett and Ava. She also includes several hashtags, including #ImAlreadyCrying.