Bikini

Megan Fox turns 27 today! She's been heating up Hollywood for years, and to celebrate her big day, we're taking a look at some of her sexiest shots. Megan has had plenty of steamy red carpet appearances, lingerie photo shoots, and hot bikini moments during her career, but we've narrowed them down to 27 of the hottest pictures. Click through to see them all!

, AKM-GSI

Tiger Woods and his girlfriend, Lindsey Vonn, kicked off the week with a relaxing afternoon on the water in Palm Beach. On Tuesday, the duo went boating on Tiger's yacht, Solitude, with his kids, Charlie and Sam. Tiger lounged shirtless while he fished off the side of the vessel, and Lindsey was spotted snapping pictures from the dock in her bikini. The couple are back to Tiger's home base in Florida after traveling to NYC to attend the Met Gala earlier this month. Tiger will be on the go again soon, though, since he's set to host his annual Tiger Jam charity poker tournament in Las Vegas this Friday and Saturday.

Tiger and Lindsey have been going strong since revealing their relationship in March and have showed mutual support for each other publicly. Lindsey's had Tiger by her side as she recovers from the knee injury she sustained during the skiing world championships in Austria in February, and she cheered him on during the Masters last month.

The 2013 Cannes Film Festival is underway, and along with our star-studded arrival coverage, we're taking a look back at some of our favorite celebrity boating moments. When it comes to Cannes, stars love to let loose at yacht parties, but they also hop on board during their downtime in other locations. Brad Pitt, George Clooney, and Matt Damon set sail together to promote Ocean's Twelve, while Beyoncé got some sun before diving in for a snorkeling session. Scarlett Johansson lounged in her bikini with her bodyguard, and Kate Moss held hands with Jamie Hince while leaping from a lavish vessel in St. Tropez.

We're celebrating Cannes with a cheeky look at celebs on boats — click through to see their best moments afloat!

Source: Tumblr user Beyoncé Knowles, Getty, FameFlynet

OK, ladies, it's time to get serious. If you're planning on losing a few pounds before you hit the beach this Memorial Day, you've got two weeks to plan. Read on: we've got some no-fail tips for you to tone up and lose weight in two weeks.

The honeymoon continued for Keira Knightley and her new husband, James Righton, in Corsica today. Keira wore a bikini for a dip in the ocean, though she's showed off other looks with her laid-back honeymoon style, which has even included wearing the same dress three different ways! For her dressed-down swim, she was joined by shirtless James, who showered her with kisses in the water. They've been all about the sweet PDA during their romantic getaway and showed similar affection while enjoying lunch and strolling the beach last week.

Keira and James jetted off to France after tying the knot on May 4. They were wed at the town hall in Mazan and celebrated after the ceremony with friends and family at a reception held at her parents' farmhouse.

This series of yoga poses was designed with your bikini, strapless dress, and short skirt in mind. Aimed to tone the thighs, tush, and core, as well as the upper body, doing this sequence daily will help diminish love handles, saddlebags, and that lovely arm flab that jiggles when you wave. This total-body toning sequence will have you feeling long and strong, just in time for baring your bod this Summer.

Hayden Panettiere hit the beach on Mother's Day with her boyfriend, Wladimir Klitschko, in Miami. The couple seem to be making a trend of spending holidays on the warm Florida sand since they also celebrated Easter on the beach back in March. Hayden may have had time for a bikini break, but she's also gearing up for the season finale of Nashville, which will air on May 22. While Hayden has gotten a lot of praise for her sassy role on the show as country star Juliette Barnes, she admits that she wants to distance herself from the character. Hayden said in a recent interview with New York Magazine, "I would need to separate myself from Juliette Barnes and be seen as Hayden. And that's a very difficult thing to do sometimes." Hayden added that despite critics linking Juliette to Taylor Swift, she doesn't model her after the pop singer. She said, "[The comparison] kept coming out, and I didn't want her to feel like it was per me, or that I was thinking that I was playing her."

Hilary Duff escaped to Mexico with her family over the weekend to celebrate Mother's Day. She had husband Mike Comrie, son Luca, and sister Haylie along for the celebratory trip, which she recognized on Twitter, writing, "Feel so very lucky to be a mother today! And everyday! Happy Mother's Day to all the mothers out there, it can be a hard job but the best! Good work!" Hilary also shared her thoughts on motherhood with People recently, adding that, "I think asking for help on a tired day isn't a sign of weakness. A lot of changes have come into your life quickly and it's important to take time for yourself!"

Hilary wore a bikini during the sunny days, which included hanging out poolside, hitting the beach, and kicking a ball around the grass. Hilary is just one of the many famous moms who celebrated Mother's Day in a special way including Jessica Alba, who went out to brunch with her family of four.

Candice Swanepoel hit the beach on Saturday in several sexy bikinis for a Victoria's Secret photo shoot in St. Barts. She isn't the only VS Angel who is in town to model two-pieces — Lily Aldridge wore a bikini for a shoot on Thursday. Candice jetted off to the Caribbean after taking part in a cowboy-inspired editorial with fashion photographer Terry Richardson in Utah. She wouldn't reveal what the session was for, but she posted plenty of pictures of Utah's Monument Valley on her Instagram.

Don't forget to vote for your favorite celebrities in our POPSUGAR 100 bracket! You may even get a chance to win a Victoria Beckham handbag.