Prepare to flip out over Tarek El Moussa and Christina Haack ’s latest reunion.

The former couple joined forces to their daughter Taylor El Moussa 's 15th birthday with a blended family gathering.

Indeed, Christina marked the occasion with a group photo, featuring her and Taylor, who donned a pink dress, as well as Tarek, their son Brayden El Moussa , 10. Plus Tarek’s wife Heather Rae El Moussa and their son Tristan El Moussa , 2, Christina’s son Hudson Anstead , 6, whom she shares with Ant Anstead , and her new boyfriend Christopher Larocca .

As Christina wrote alongside her Sept. 23 Instagram Stories post, "Celebrating our girl."

While marking the teen’s latest milestone, Christina also shared insight into her tight bond with Taylor—and what it means to

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