These days, with all the summer and heat waves, most celebs can be seen in the major hot spots, hitting the beach. Not an exception to this golden rule is 'Playboy's favorite playmates, Pamela Anderson and Lindsay Lohan.

On occasion of their birthdays, both went to work on their tan (not together, of course), Pammy in Saint Tropez and little old Lindsay in Malibu. Nobody knows about Tom Cruise's birthday party or, for that matter, if he had one. Come to think of it, he may still look hot, but he is 44 and dating a teenager...

Anderson just turned 39 and, even if something might be wrong with her face (or maybe she just isn't photogenic anymore), she managed somehow to maintain her curvy, yet slim, figure. Although the red bikini does almost nothing for our imagination because she just bared it all in a window shop, nobody can deny that most women would kill for a body like hers.

Lindsay tried to keep her birthday plans a secret but failed to do so and spilled it all out in an interview in 'Harper's Bazar'. For her 20th birthday, the actress chose to lie on the beach and to hang out with her brother (who, by the way, looks far better than she does lately). What happened to the crazy party girl? Is she really trying to prove that she is a grown up now?