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?
2 of 13
Guess who is having a laugh on her kickboard?
3 of 13
Guess which beauty is showing off her balancing skills?
4 of 13
Guess which hot actor wiped out?
5 of 13
Guess which starlet was braving the choppy water?
Sarah Michelle Gellar
6 of 13
Guess who is showing off his super-toned body after a trip to the beach?
7 of 13
Guess who's enjoying some surfing success?
Robert Downey Jr.
8 of 13
Guess who is rockin' the full-body wet suit?
9 of 13
Guess who is taking a break to soak up a little sun?
10 of 13
Guess who is trying out paddle surfing?
11 of 13
Guess who is looking like a natural on his board?
12 of 13
Guess who is looking like a pro?
13 of 13
Guess who is surfing like a rock star?
Pop Quiz, Hot Shot: Week of 7/13/08