AnnaLynne McCord and her castmates filmed scenes for 90210 on Malibu Beach and while they recited their lines we could not stop staring at AnnaLynne's black string bikini. After some digging around, we tracked down the sexy swimsuit: Agent Provocateur's Kristie ring bikini top ($270) and matching bottoms ($220). You can also get it at Net-A-Porter. It's a pretty price to pay for a bikini, but imagine all the fawning you'll get while wearing it around the beach! It's not the best style if you want to avoid tan lines, but it would turn quite a few heads at a pool party. Wear it with a cover-up à la AnnaLynne or on its own for a dip.