Jax Taylor's girlfriend, Brittany Cartwright, took to Twitter on Monday to wish the Vanderpump Rules star a Happy Birthday. Over a year into their relationship, Taylor and Cartwright are going strong, and judging by the looks of her recent social media feed, fans will be seeing plenty more of her when the show returns for Season 5 later this year.

As filming continues on Vanderpump Rules Season 5, the cast has been celebrating a number of special events, including Katie Maloney's bridal shower and Tom Sandoval's birthday party. And now, they are reportedly headed for yet another set of festivities.

"Happy Birthday to my baby [Jax Taylor] I love you sooo much!" Cartwright wrote on July 11.

Also with her post was a pair of kissing emojis.

Jax Taylor is celebrating his birthday on an island

After welcoming Cartwright's mother to Los Angeles earlier this month, Taylor and Cartwright, and possibly some of their co-stars, are heading to Catalina Island for his birthday. However, it's hard to say whether or not the event will be filmed. Since arriving to their vacation, Taylor and Cartwright have been active on social media, and Taylor shared a couple of photos on July 10. In one photo, Taylor showed off an impressive pre-birthday meal, which featured crab legs and vegetables. In a second, a birthday cake reading "Happy Birthday Jax" was seen. 

"Thank you [Scheana Marie] and [Mike Shay] for my amazing and favorite ice cream cake ever," Jax Taylor wrote, revealing that the cake was purchased from Baskin Robbins.

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Jax Taylor and Brittany Cartwright are going strong

Taylor and Cartwright began dating during Vanderpump Rules Season 4 and have been doing great ever since. In fact, Cartwright has been spending tons of time with her live-in boyfriend and their co-stars, which seems to hint that she may have taken on a full-time role for Season 5.

For more of Jax Taylor, Brittany Cartwright and the rest of the cast, tune into Vanderpump Rules Season 5, when the new season premieres on Bravo later this year. A premiere date has not yet been confirmed.