Kim Kardashian turns 33 today, and we're celebrating the major milestone with a look back at her sexiest bikini pictures. It's been a big year for Kim and her family, especially boyfriend Kanye West. The couple welcomed daughter North West in June, and Kim made sure to let the world know that she's back in bikini-ready shape with a recent swimsuit photo on social media. From hitting the beach in a bikini to posing for photo shoots in sexy two-pieces, we've rounded up over 30 of Kim's best swimsuit photos. Happy birthday, Kim — here's to another year full of great bikini moments!