Spring is in full bloom and with Summer just around the corner, we can't help but notice that bikini season has officially started here on PopSugar. Just this week we've seen Heidi Montag, Lindsay Lohan, and Rihanna enjoying some fun in the sun time, but have you been paying attention to the swimsuit-clad stars of the past? Take our quiz to find out, and check out all of the bikini goodness here.

1 of 10
Guess who's in green?
Anne Hathaway
Christina Ricci
Katy Perry
Lily Allen
2 of 10
Guess who's rocking the red?
Lauren Conrad
Nicole Richie
Hilary Duff
Nicky Hilton
3 of 10
Guess who chatted away on the beach?
Taylor Momsen
Kristen Stewart
Kate Bosworth
AnnaLynne McCord
4 of 10
Guess who rang in the new year in Miami?
Lindsay Lohan
Kristin Cavallari
Amanda Seyfried
Nicollette Sheridan
5 of 10
Guess who's walking the beach with her man?
Lauren Conrad
Katherine Heigl
Chloe Sevigny
Jenny McCarthy
6 of 10
Guess who took a swim?
Whitney Port
Heidi Montag
Stephanie Pratt
Olivia Palermo
7 of 10
Guess who's gearing up for a boat ride?
Jessica Simpson
Bar Refaeli
Carmen Electra
8 of 10
Guess who accessorized her bikini with a bracelet?
Kate Hudson
Ali Larter
Ashlee Simpson
Claire Danes
9 of 10
Guess who's beautiful in blue?
Jessica Alba
Miranda Kerr
Nicky Hilton
Kate Beckinsale
10 of 10
Guess who's looking futuristic?
Hayden Panettiere
Lady GaGa
Paris Hilton
Britney Spears
Guess Who?
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Guess Who?