Cindy Crawford showed off those famous long legs of hers while walking on the beach during a family vacation to Mexico over the weekend. Looks like she got some alone time with her bikini and a book while Rande Gerber played in the ocean with their kids and friends. The supermodel recently posed for Vogue Paris and looked gorgeous as usual.

Now that you've got your bikini and beach body trivia down cold, it's time to kick it up a notch. Summer is in full swing, which means it's prime time for our favorite stars to hit the beach and test out their skills at water sports. Take our quiz to see how much you know about who's riding the waves and who's wiping out.

Ashley Tisdale celebrated her 23rd birthday yesterday (Happy Birthday!) hanging out on the beach in Hawaii with her boyfriend Jared Murillo. She showed off her bikini body underneath a sensible sun hat enjoying her time off after wrapping filming on High School Musical 3.

Ellen DeGeneres and Portia de Rossi looked like a picture perfect couple strolling hand in hand through Rome and later at lunch yesterday. They had some fun followed by their own videographer even taking a moment to film the friendly paparazzi. The happy couple is already making plans for their upcoming wedding, but it's never too early to start checking out romantic spots for the honeymoon.

What happens when two super-attractive, scantily-clad individuals decide to get all cozy and cuddly in public? Magic. Well, maybe not magic, but whatever you would call the exact opposite of this. Yikes.

Jennifer Aniston spent some time exploring Amsterdam on a canal tour yesterday before heading to the UK on a flight one day after her man John left the city. While it may seem like she's following John on tour, Jen's been going at her own pace with her own agenda while abroad, including promoting Marley & Me at a Cinema Expo.

Orlando Bloom slipped out of his t-shirt and showed off that shirtless beach (or pool) body on a little vacation with Miranda Kerr on Gran Canaria Island, Spain this past weekend. Mmmmanjoyment Tuesday!

Just as we predicted, John Mayer and Jennifer Aniston found time for one more mini beach vacation before he sets off on his summer tour. This time the sun loving duo headed down to Punta Mita, Mexico for a little stay at Casa Aramara, which belongs to Joe Francis (ew). Celebrities love to head down to the luxe estate, including Aniston herself a few times.

Dennis Quaid and his wife Kimberly took out their twins for a stroll while they were in Hawaii for the Maui Film Festival.

Jessica Simpson has had her share of ups and downs in Cabo from her breakup trip with John Mayer to a romantic vacation with Tony Romo and her family to dateless birthday times. As for this most recent jaunt south, we're not sure if it's to get away from ending things with Tony or just a moment away before getting back to him, but it looks like she's having fun on her trip already.

Britney Spears is living the beach babe life on her little Costa Rica vacation. While her celebrity host, Mel Gibson, and his wife have stayed out of the camera's view, Britney's showing off her bikini body and taking advantage of all the activities. From boogie boarding to driving around on an ATV, this little relaxing weekend with her dad seems like the perfect escape for the popstar.

Britney Spears looks like the Greek goddess Aphrodite being born from the seafoam in this photo. But, she's actually in Costa Rica enjoying a vacation with her old neighbor Mel Gibson.

Fergie and Josh may be vacationing in the Bahamas, but that doesn't mean they're taking a break from their fitness regimen. Gotta keep these bikini bodies in tip top shape, right? Fergs was so super serious that she even chose her headphones over a little friendly jog conversation with Josh. We're sure he's used to her dedication by now, but hopefully Fergie made it up to her fiancé with a few kisses when they went for a post-workout swim in the ocean.