Nicole Richie slipped into a nude-colored Melissa Odabash bikini to hang by the pool in Cabo San Lucas, Mexico, on Sunday. She showed off her tiny frame while sunbathing with a group of friends, including Kelly Sawyer and designer Katie Nehra. The girls snapped selfies while relaxing near the beach, and Nicole even let a server in on the fun by including him in a candid photo. Nicole is currently on a girls-only weekend in Cabo to celebrate her 32nd birthday, which was on Saturday. She took to Instagram to share a photo of chocolate-covered strawberries spelling out "happy birthday" as well as a snap of her stylish beach essentials. In honor of Nicole's big day, we took a trip down memory lane with her epic transformation over the years and highlighted her most hilarious tweets.