Birthday in paradise! Kristin Cavallari celebrates turning 30th in Mexico wearing bikini by Audrina Patridge

Published: 23:31 GMT, 13 January 2017 | Updated: 03:01 GMT, 14 January 2017

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She was born on January 5 but the celebration is still going strong.

Kristin Cavallari shared moments from her 30th birthday trip to Mexico on social media over Thursday and Friday, showing off her toned tummy and bright smile to her many followers.

'Never leaving,' the Laguna Beach and The Hills star wrote with one photo posted Friday, taken by her hair stylist, Scotty Cunha.

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It's a party! Kristin Cavallari shared moments from her 30th birthday trip to Mexico on social media over Thursday and Friday, showing off her toned tummy and bright smile

The mother-of-three showed off her killer body in a striped balconette bikini top with modest bottoms designed by her friend and former co-star, Audrina Patridge, 31.

'PS I'm obsessed with my Prey swimsuit by my girl @audrinapatridge !!! So proud of you babe [heart emoji],' she added.

Audrina starred alongside Kristin in MTV's The Hills from 2007-2010. In addition to a film credit, the two share a passion for fashion design.

'Never leaving!': She was born on January 5 but the celebration is still going strong

On Wednesday the shoe and jewelry designer revealed to her fans that she was leaving Emerald Duv, the accessories line she started in 2015 with friend Chelsea Bulte.

'I've decided to launch my own jewelry line, and since I was solely designing the past collections at Emerald Duv, it will have a similar aesthetic: effortless, timeless, and refined,' she shared with fans from her Instagram account.

'I'm hoping to have my new line launched by April but stay tuned!!'

If there were any hard feelings over the split, the entrepreneur didn't let it ruin her fun with husband Jay Cutler, 33, quarterback for the Chicago Bears, on their tropical vacation.

Living life: The entrepreneur didn't let it ruin the jewelry line split ruin her fun with husband Jay Cutler, 33, quarterback for the Chicago Bears, on their tropical vacation

In love: Kristin posted pictures with her handsome hubby letting loose, soaking up the sun and cuddling under the stars

Kristin posted pictures with her handsome hubby letting loose, soaking up the sun and cuddling under the stars.

Everyone was clearly in great spirits and having a wonderful time, fueled by spirits consumed on the trip.

Scotty laughed and danced with the Balancing in Heels author on the beach, with a cocktail in one hand and a camera in the other.

Kristin is currently in development of her second published work, a cookbook titled True Roots, scheduled to be printed in spring 2018.

In good spirits: Scotty Cunha laughed and danced with the Balancing in Heels author on the beach, with a cocktail in one hand and a camera in the other