Heidi Montag Celebrates Son Gunner's 5th Birthday With Video Tribute; 'You Truly Take My Breath Away'

Heidi Montag is celebrating her firstborn's fifth birthday with a walk down memory lane. In an Instagram post, the reality star shows clips of her son Gunner Stone from birth through present day set to the song "Take My Breath Away" by EZI.

The loving caption reads, "Happy 5th Birthday my angle @gunnerpratt ✨ you truly take my breath away. I thank God on my knees for you ever day. Being your mom has been the biggest blessing. You are so loving, sweet, funny, fun, thoughtful, strong, smarts, I could go on forever. Thank you for marking me a mama. Best day of my life 💕 where had the time gone?"

Montag, 35, features her little boy and their adventures together, along with husband Spencer Pratt, 39, on her Instagram page often. This summer, the soon-to-be family of four visited Disneyland for the first time. They also spent some time enjoying Hawaii together as a family.

"The Hills: New Beginnings" star also took Gunner on a "special alone trip" to enjoy some bonding time together before the new baby's arrival. "The Hills" alum captioned a video of their trip to what appears to be Colorado, "I wanted to have a special alone trip with @gunnerpratt before the baby comes. It was such a soul filling trip taking my angel to the place that will always feel like home. Such a blessing to have so much family time. 🙏🏼"

The couple announced the news that they are expecting their second child, who's due December 1, back in June. Montag shared their gender reveal in July on her Instagram page captioning the post, "It’s a… BOY!!!!!! 💙💙💙💙💙 Such a beautiful surprise! I was convinced it was a girl lol! We are beyond excited and blessed to have another son and a BROTHER for @gunnerpratt !"

Montag told Entertainment Tonight that her intuition was off and the news of a baby boy is exciting for Gunner. "Growing up I always wanted boys and then recently, I kinda started thinking, I don't know, I kinda want a girl and having one of each," she explained. "For Gunner, he really wants a brother, so, you know, ultimately I want what would be the best for him and his life."

Montag hasn't been shy about sharing her pregnancy and photos of her growing belly. She has posted many of her pregnancy photo shoot snaps. One post was captioned, "There is nothing more beautiful than pregnancy. ✨Also for many women nothing harder and more challenging. The beauty from ashes. God bless all you mamas out there 🙏🏼 Your strength is inspiring." A video of her maternity photo shoot was also posted along with the caption, "There is no time like pregnancy. It’s been incredibly beautiful and challenging. So excited to hold my sweet angel! #blessed."