As she headed to Cabo San Lucas, Mexico, the bride-to-be seemed to follow her own rules.
Earlier this month, the fashion designer took to her lifestyle blog to offer some tips on ladylike etiquette during such a weekend.
Making her list: Watch what type of photos you post on social media.
Based on the snapshots posted by her group – which included her The Hills costar Lo Bosworth and longtime friends Maura McManus, Hannah Skvarla and Jilly Hendrix – they followed her advice ... well, for the most part!
Adding the hashtag "#donttellmrtell" (Conrad is set to marry musician and law student William Tell) to their snaps, the ladies had a fun and fashionable time by the ocean.
Among her other rules: Make sure to keep your wardrobe classy and drink responsibly. No surprise here, Conrad, 28, and her ladies showed off their on-trend style with their colorful framed sunglasses, airy dresses, bright prints and crop tops.
As for drinking responsibly, Bosworth showed off one measure the bachelorette crew took. The ladies stamped their wrists with the message: "I belong to Lauren's bachelorette party. If I'm lost, please buy me a drink."
Besides hitting the pool and beach, they also stopped in at Flora Farm, a 10-acre valley farm famous for its farm-to-table cuisine.
Conrad and Tell began dating in 2012 and announced their engagement in October.