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.

Miley Cyrus is seen swimming and playing in the sand with friends while taking a break from her video shoot. Scandalous!Click any photo to view all the photos in the gallery!

Click the photo to find out who it is. It's the lovable James Blunt!

Uh, hi, Andy. Yeah, I'm J. Nice to meet you. Wow, you were really going for it out there, huh? You really know how to surf! Do you need any help with that wetsuit? No? Ah, no prob. Wow, that rubber's pretty tight. Really tight. Kinda creeps up on you there.

Find out who the celebrity is by clicking the photo. It's the lovable Jerry O'Connell!

Here's Lisa Rinna and her husband Harry Hamlin spending a day at the beach in Malibu with their daughter.

Kim Raver toughs it out on the set of Lipstick Jungle. Kim and her shirtless co-star Robert Buckley film a scene and enjoy some downtime on the set of the hit TV show Lipstick Jungle.

A few more photos from the campaign have surfaced. So of course we're sharing them with you.

I guess I could have shortened that title to "David Beckham Blogs About His Wiener Ruckus" but I couldn't remember if "wiener ruckus" was an actual term, or just one I made up, so I decided to err on the safe side.

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.

Things must be going well for Nick Lachey and Vanessa Minnillo because we haven't heard a peep from these two in a long-ass time. Here are some pictures of the couple spotted out in Salt Lake City, Utah on a Mormon retreat.

Pirates of the Caribbean star Orlando Bloom and Victoria's Secret model girlfriend Miranda Kerr were spotted on vacation in Gran Canaria wearing next to nothing.

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!

Matthew McConaughey and Camila Alves celebrated the first official weekend of Summer in the best way they know how — at the beach 24/7. The expecting couple played in the waves, had a picnic and stole kisses on the sand on Saturday. Judging from Camila's sheer sarong, she's certainly not letting her baby bump get in the way of her sexy swimsuit preferences.

It was 97 degrees yesterday in L.A. after all. Matthew McConaughey and some pals hop in the back of a truck and head to the beach for a surfing safari. Also tagging along was Matt's pregnant girlfriend Camilla Alves.

It's been a while since we've featured Crisitano Ronaldo, so we figured this would be a pleasant way to start off hump day.Click any photo to view all 15 photos in the Cristiano Ronaldo gallery.

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.

Believe it or not, it's been over 6 months since we last had a Matthew McConaughey beach sighting, but he was back in all his shirtless glory for a surfing trip with his buddies on Saturday. Before that, he fulfilled his duties as a doting dad-to-be on a walk with Camila around LA on Friday. He might not be the new dad you're most excited for, but he's still holding his own as one of the hottest guys on the beach.

When Matthew McConaughey is seen sans his shirt, we know that summer has arrived. The actor is seen here enjoying the beach and a Bud Light in Malibu.Click any photo to view all 21 photos of a shirtless Matthew McConaughey in the gallery!

His body and his face. More Reichen Lehmkuhl are after the jump. Photos: FantasticMag.com

Photos: BauerGriffinOnline

And they're on full display right here.

Someone could use a little more sun.

It's called acting people!