"When I met you, you were still running around in diapers and you have grown up to be a strong willed, lovable, funny boy," she wrote in a sweet tribute Heather Rae El Moussa/Instagram is celebrating her "bonus son" ! On Tuesday, Aug. 20, the HGTV star, 36, marked her stepson's 9th birthday with a loving tribute filled with various photos from his childhood. "Can’t believe my handsome bonus son is 9 today.

When I met you, you were still running around in diapers and you have grown up to be a strong willed, lovable, funny boy," the alum wrote. Related: "You make everyone around you laugh. You remind me so much of your daddy and I am so lucky that I get to be your stepmom.

I love you so much Bray Bray. Happy birthday love.❤️," her caption continued.

Along with Brayden, the reality television personality is also a stepmom to 13-year-old , who , shares with his ex-wife, . Tarek, 42, and Heather welcomed their first baby together, son , . Heather Rae El Moussa/Instagram To honor the birthday boy even more, Heather shared photos of him on her Instagram Stories, including a sweet photo of him hugging a puppy.

"It's Bray's birthday today!! 🥺🎂🤍I love him so much I can't believe he's 9," she wrote over the photo, which was also shared on Tarek's social media account. Over the weekend, the birthday boy celebrated the milestone with a shark-themed party, similar to . The party .

Heather Rae El Moussa/Instagram Related: In March, Heather reflected on how "I got my feet wet .