Nicole Richie rocked a bikini in Cabo San Lucas on Friday. She was in a strapless black two-piece to lounge by her hotel pool with a similarly swimsuit-clad Samantha Ronson. The girls also showed some skin Saturday during a jaunt to the beach. They're south of the border, hanging out with other pals like Jessica Simpson and Ashlee Simpson. Any rumors that Nicole and her Fashion Star cohost Jessica are feuding were put to rest when the girls met up for lunch yesterday. The fun vacation comes just days after Nicole Richie turned 30. We celebrated by looking back at some of her sweetest moments with pals, and it seems those real-life BFFs whisked her away for a couple days of fun in the sun. On the actual day, last Wednesday, Jessica tweeted to Nicole, "Happy birthday Nicole Richie! Today don't feel guilty about mixing your pressed green juice with vodka. Huge hug and boobie bump!"