Heather Rae El Moussa Celebrates Tarek's Daughter Taylor's 13th Birthday: 'I Love Being Your Bonus Mom'

The 'Selling Sunset' star and her husband Tarek El Moussa posted sweet birthday messages to Taylor, his daughter with ex-wife Christina Hall

Heather Rae El Moussa is sharing the birthday love for her "bonus" daughter Taylor on her milestone birthday.

The Selling Sunset star posted a sweet Instagram message to her husband Tarek El Moussa's daughter Taylor, who turned 13 on Friday.

"Happy birthday beautiful girl! 🤍🫶🏻 I can’t believe you are 13 today!" the realtor began in the caption to a carousel of photos featuring the mother-figure and her stepchild snuggling, bonding and enjoying blended family time together.

"I’ve watched you grow into a smart witty, confident, sweet but strong willed young lady," El Moussa continued. "You have such a huge heart and you are truly unstoppable. I love you so so much and I love being your bonus mom. 🤍."

In one photo, Taylor can be seen laying on a nest of pillows and blankets as she embraces her younger brother Tristan, 8 months, whom El Moussa shares with Tarek, 42.

In another photo, El Moussa and Taylor appear to be in a makeup laboratory to try out lip colors. Both are sporting bouffant caps, which stops hair from contaminating sanitary areas, while Taylor watches her stepmother closely as she puckers up to a hand mirror.

Taylor's younger brother Brayden James, 8, whom Tarek shares with ex-wife Christina Hall, also appears in a photo.

Tarek also posted a lengthy birthday message to Taylor on Instagram, writing, "I could literally cry because my baby girl is no longer a baby…and turned 13 today!😭😭😭…."

Related: Tarek El Moussa and Heather Rae El Moussa Get Matching Tattoos: 'This Is Real Commitment!'

He continued, "Man, time flies and life is short! It feels like yesterday we were at Chuck E. Cheese negotiating over what toys she could get lol. She always got what she wanted though, apparently she’s a better negotiator than dad!"

The host of Flipping 101 described his "very special relationship" with his only daughter, who helped him through some of the "toughest periods" of his life.

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.

"During that time we became best friends, and that never ended," Tarek explained. "I’m just so proud of the young lady she’s become! She’s a beautiful, hard working, honest, loving and athletic teenager. I seriously couldn’t have asked for a better kid. And she’s looking more and more like @thechristinahall every day. She’s just beautiful inside and out and I’m so lucky to call this little girl mine❤️."

It's been a week of birthday blessings for El Moussa, who on Monday posted a video showing what she got up to over the weekend as she celebrated turning 36 on Sept. 16 with husband Tarek.

“Birthday weekend recap 🤍," she wrote in her caption on Instagram. “The best birthday yet — and the icing on the cake is that I already had all the gifts I could ask for.”

Related: Heather Rae El Moussa Calls Breastfeeding 'My Favorite Thing,' But Says 'Health Struggles' May Bring an End

On Saturday, Tarek honored his wife's birthday in a tribute post.

"When I wrote @theheatherraeelmoussa’s birthday card I started thinking about our journey," Tarek captioned the post. "We moved in together a few days after our first date and today we are celebrating her birthday for the 5th time! When we met, we talked about everything we wanted."

"Almost 5 years later it’s all come true. We are married, we have a son, we have a show, we have businesses, and we are still best friends," he added. "Happy birthday bunny, I couldn’t do this life without you!:) I love you more and more every day. ❤️."

For more People news, make sure to sign up for our newsletter!

Read the original article on People.