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...

Source: TMZ.com