Rihanna's been through a lot these past years, what with ex- (and possibly current?) boyfriend Chris Brown and their controversial relationship and it looks like she took some time to unwind in Hawaii the other week with what appears to be a blunt-that is, marijuana wrapped in cigar paper.

Here are the pictures captured by paparazzi (including a bonus shot of Rihanna's spliff-shaped birthday cake), and then photos of five other celeb stoners...

Rihanna posted to her Facebook, "Kush rolled, glass full... I prefer the better things!" but later clarified that she was posting lyrics to Drake's song Up All Night.

The cake at Rihanna's birthday party the other day, with a Rihanna made out of icing riding the thing.

The National Enquirer quoted a friend of Paris Hilton as saying, "She said the munchies were making her eat too much and she couldn’t believe how much weight she had gained."

Reporters are that Kristen Stewart smoked pot frequently when she was in Vancouver filming 'New Moon,' but it was only when she got to the States that she got caught on camera.

Charlize Theron looks a bit old to be smoking out of an apple, which is normally reserved for high schoolers, but we can cut her some slack—it was 2002.

Lindsay Lohan holds a "bowl," a glass pipe used for smoking marijuana, while flipping off the camera.

Michael Phelps' infamous bong shot at a University of South Carolina party led the Olympic gold medalist to issue a statement saying: "I'm 23 years old and despite the successes I've had in the pool, I acted in a youthful and inappropriate way, not in a manner people have come to expect from me. For this, I am sorry. I promise my fans and the public it will not happen again."