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.

1 of 13
Guess whose surfing skills are much better than his social skills?
Zac Efron
Spencer Pratt
Chace Crawford
Emile Hirsch
2 of 13
Guess who is having a laugh on her kickboard?
Rachel Bilson
Kate Beckinsale
Penelope Cruz
Leighton Meester
3 of 13
Guess which beauty is showing off her balancing skills?
Charlize Theron
Jennifer Aniston
Cameron Diaz
Gisele Bundchen
4 of 13
Guess which hot actor wiped out?
Ben Affleck
Shia LaBeouf
Ryan Gosling
Jake Gyllenhaal
5 of 13
Guess which starlet was braving the choppy water?
Kate Bosworth
Ashlee Simpson
Sarah Michelle Gellar
Nicole Richie
6 of 13
Guess who is showing off his super-toned body after a trip to the beach?
Nick Lachey
Josh Duhamel
Wentworth Miller
Ryan Phillippe
7 of 13
Guess who's enjoying some surfing success?
Owen Wilson
Robert Downey Jr.
Matt Damon
Mark Wahlberg
8 of 13
Guess who is rockin' the full-body wet suit?
Gwyneth Paltrow
Claire Danes
Heidi Klum
Zooey Deschanel
9 of 13
Guess who is taking a break to soak up a little sun?
Jennifer Aniston
Blake Lively
Keri Russell
Cameron Diaz
10 of 13
Guess who is trying out paddle surfing?
Kate Hudson
Jennifer Garner
Jessica Biel
11 of 13
Guess who is looking like a natural on his board?
Orlando Bloom
Justin Timberlake
Ben Affleck
Leonardo DiCaprio
12 of 13
Guess who is looking like a pro?
Kelly Slater
Matthew McConaughey
Lance Armstrong
Ryan Reynolds
13 of 13
Guess who is surfing like a rock star?
Helen Hunt
Drew Barrymore
Felicity Huffman
Naomi Watts
PopSugar Pop Quiz for the week of July 13, 2008
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Pop Quiz, Hot Shot: Week of 7/13/08