Tori Spelling is thankful for the special bond she and her stepson, Jack McDermott, share.

In a sweet birthday message to Jack, the “BH90210″ actress looked back at their relationship, right from the beginning.

“Okay, I’m going to embarrass you for a second @thejackmonty,” she wrote. “I’ve known this guy since he was almost 7. I loved when we met because he had no idea who I was. And, I don’t mean Tori Spelling, but the woman his dad was dating.”

Spelling wed Jack’s father Dean McDermott in 2006. Dean and Jack’s mom divorced when Jack was 6-years-old.

RELATED: ‘BH90210’ Stars Tori Spelling And Jennie Garth Dish On Finale And Season 2 Plans

She later remembers “helping him with his homework and reading Charlottes Web, dressing up his hamsters in DIY Halloween costumes, and playing Polly Pockets at the pool while other boys his age teased and we ignored them and laughed and played and had so much fun they eventually asked to join.”

“I remember his feet growing and eventually we could share the same shoes (not now he wears a 14 ha ha!). And, I then remember the years as I watched this young boy grow and try to figure out his role in our blended family,” Spelling added referencing Jack’s half-siblings Liam, 12, Stella, 11, Hattie, 7, Finn 6, and Beau, 2.

View this post on Instagram

Ok I’m gonna embarrass you for a second @thejackmonty … – I’ve known this guy since he was almost 7. I loved when we met bc he had no idea who I was. And, I don’t mean tori spelling,but the woman his dad was dating. He was going thru so much and his mom and dad were trying their best to navigate a very difficult situation for a boy his age. Divorce. When we met we bonded over dogs, his rabbit DIY school project, tag, hide and seek, and video games. He called me Teri. And I didn’t correct him bc I loved that he had his own perception of me. This little boy grew. And, I remember helping him with his homework and reading Charlottes Web, dressing up his hamsters in DIY Halloween costumes, and playing Polly Pockets at the pool while other boys his age teased and we ignored them and laughed and played and had so much fun they eventually asked to join. I remember his feet growing and eventually we could share the same shoes (not now he wears a 14 ha ha!). And, I then remember the years as I watched this young boy grow to be a pre teen and a teen and try to figure out his role in our blended family. Then came years of awkwardness. He was quiet. I was quiet. It was new to me and I never wanted to push my role in his life. I’ve loved him since he was that little boy that called me Teri and played Polly Pockets with me. And, then he came out. I was so proud of his confidence. He was who he was and he was proud of it. And, then we bonded again. We found each other on a new level with a whole new respect for each other. He’s 21 today. I’m so proud of the amazing human he is. He is so smart, kind, funny, unique, sweet, confident, and driven. His scream, smile, and laugh are contagious and his style is fierce. He makes no apologies for who he is. And who he uniquely is … Is Jack Montgomery McDermott. Someone who is an inspiration. Someone who has overcome many challenges thru out his young life and comes out on top no matter what. You are a fighter and a beautiful human @thejackmonty . – PS- I know we both hate emotions so I’ll stop now. Happy 21st Birthday! I Love you Jacky Boy. Xoxo

A post shared by Tori Spelling (@torispelling) on

RELATED: Tori Spelling Sets The Record Straight On Her Plastic Surgeries

And when Jack opened up about his sexuality, Spelling says she couldn’t have been more proud.

“And, then he came out. I was so proud of his confidence. He was who he was and he was proud of it. And, then we bonded again. We found each other on a new level with a whole new respect for each other,” she said.

She concluded, “He’s 21 today. I’m so proud of the amazing human he is.”