It's just about Summer, and that means it's time for many of our favorite celebs to head to the beach and onto a yacht. Take a look at these photos from warm days past and test your knowledge of which stars are on a boat.

1 of 10
Guess who's sporting a decorated bikini?
Mischa Barton
Kristen Stewart
Nicole Richie
Nicky Hilton
2 of 10
Guess who's in a yellow two piece?
Alicia Keys
Tyra Banks
Leona Lewis
Beyonce Knowles
3 of 10
Guess who's swinging his feet over the side of a yacht?
Matt Damon
Mark Wahlberg
George Clooney
Matthew McConaughey
4 of 10
Guess who's slicking back her hair?
Kristin Cavallari
Lauren Conrad
Kristen Bell
Hayden Panettiere
5 of 10
Guess who's dangling from a boat?
Ashton Kutcher
Tom Cruise
Ben Affleck
Jake Gyllenhaal
6 of 10
Guess who's taking her shirt off?
Kate Hudson
Kirsten Dunst
Kate Moss
Sienna Miller
7 of 10
Guess which father-son duo is at sea?
Gavin and Kingston Rossdale
Matthew and James Wilkie Broderick
Brad Pitt and Pax Jolie-Pitt
Hugh and Oscar Jackman
8 of 10
Guess who's chatting away with his shirt off?
Orlando Bloom
Robert Pattinson
Zac Efron
Josh Hartnett
9 of 10
Guess which mother and daughter are getting in some swim time?
Jennifer Lopez and Emme Anthony
Salma Hayek and Valentina Pinault
Jessica Alba and Honor Warren
Halle Berry and Nahla Aubry
10 of 10
Guess who's wearing a hat?
Eva Mendes
Kate Beckinsale
Jessica Biel
Eva Longoria
Guess Who?
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Guess Who?