Tori Spelling and Dean McDermott Celebrate 'Limitless' Son Beau's 7th Birthday: 'Sweet Baby Boy'

Tori Spelling and ex Dean McDermott are showering their youngest son with love on his birthday.

On Sunday, the estranged couple both shared photos on Instagram in celebration of son Beau's 7th birthday. Spelling, 50, posted a video that included photos of Beau throughout his seven years, starting with when he was a baby and ending with a few recent photos.

"My baby turned lucky 7…yesterday March 2nd. I wanted to put my phone down and live in the moment with him. So, I’m posting today," the Beverly Hills 90210 alum wrote.

Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories.

"Beau is my greatest teacher on this journey. Everyday I am surprised and impressed … things that those that understand me know are hard to do," she wrote.

"He makes me laugh and learn and love hard thru it all. He is one of the best parts of me. And, one of the greatest loves of my life. Welcome to 7. Keep on challenging life. Your positive energy is contagious. And, never stop changing. Limitless. Love you my sweet baby boy. xo," Spelling ended her post.

McDermott, 57, also posted for Beau, sharing a few recent photos of his little guy. "I can’t believe this guy just turned 7!!!! My little Prince is becoming a King!! Happy Birthday Bo Bo Bear!!🎂," the proud dad wrote in his caption.

Spelling shares kids Beau, Finn, 11, Hattie, 12, and Stella, 15, and Liam, 16 with her ex McDermott.

In June, McDermott announced in a since-deleted Instagram post that he and Spelling had decided to separate after 18 years of marriage. The actor opened up in a November interview with The Daily Mail about what drove them apart.

"I just isolated more and more and more and she isolated with the kids. We were roommates," the actor said.

"Rarely, rarely, rarely did we eat together. We'd sit down and have a family meal but it was always disjointed," he added. "It made me feel worse because I knew I was a big part of [the problem] and I was at a place where I felt there was nothing I could do about it."