Could Kristen Doute be the next Vanderpump Rules star to walk down the aisle?

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Although a wedding is likely not in the near-future for the longtime reality star and T-shirt designer, she and her boyfriend, Brian Carter, appear to be getting pretty serious, which was recently evident in a birthday gift from Carter to Doute.

Along with a bouquet of flowers, Carter had a very loving message for his leading lady, which read, "For The Love Of My Life. The One Who Makes My World Go Round. I Would Be Lost Without You. Hope Your Birthday Is As Wonderful As You Are! Love You Will All My Heart! Carter Xoxo."

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While fans have yet to meet Carter on the show, a recent tweet suggested he would soon be seen.

Prior to filming the season four reunion at the end of last week, Doute told fans that her potential "plot twist" of meeting Carter was one of her favorite moments from production.

For more Kristen Doute, tune into Vanderpump Rules season four, airing on Monday nights at 9 p.m. on Bravo, and check out a sneak peek below.