Collin Gosselin Turns 14 as Dad Jon Shares Rare Pic

The Gosselin sextuplets turned 14 Saturday, and dad Jon Gosselin proudly shared a family photo of son Collin, who is rarely seen.

Collin, Us Weekly reports, is enrolled in a program with kids with special needs, and attends school away from home.

In the picture, Collin grins in front of his dad alongside sis Hannah. Jon captioned the snap, "Glad I could celebrate my son Collin's 14th birthday with him and his sister!"

Kate addressed Collin's issues in her book "I Just Want You to Know," in which she wrote, in a letter to him, "As you have grown, however, I must say you have also challenged my authority greatly. At two and a half, you began testing and trying my parenting at every chance. I called Daddy at work many days crying because you would not obey."

Earlier in the week, Jon posed for a pic with Hannah ahead of a "Bday dinner," and posted a pic telling his other kids, "I can't believe it's been this long!!! Whew that [went] fast!!! Daddy loves you all very much!!!"

Kate also addressed her kids' 14th birthday, posting a pic of a chocolate cake and writing, "Happy 14th Birthday, my 'babies'. 14 years ago almost to the minute, I was in my wheelchair, making my way around the ENTIRE NICU, meeting each of you face to face for the very first time. I'll never forget how tiny yet perfect each of you were. Alexis's blonde hair, Aaden's teeny tiny face, with alert awake eyes that didn't miss a thing, Hannah and her adorable 'human doll' face, Collin looked SO big and strong at 3 entire pounds (the biggest!), Leah had the most beautiful head of dark soft hair and Joel— literally just slept peacefully like he was at the beach in the sun!"

She went on to write, "I'll never forget our first 'birth day' together......this day remains one of the best in my life.... and 14 years later, I love you 400 times as much, if that's even possible! Happy birthday, my babies! Here's to many more birthdays together!! I love you forever and always, no matter what!"