Rihanna and Lady Gaga both dressed up as Mary Jane for Halloween parties.
We're talking about the euphemism for the drug known as marijuana, people.
RiRi donned her costume for a party she hosted in W. Hollywood, which also featured Chris Brown dressed like a terrorist and a bunch of other stars.
Gaga took her mind off Hurricane Sandy at a Puerto Rico bash, Tweeting, "BEST COSTUME EVER ITS SO FUN. Princess High the Cannabis Queen!"
Was it the best, though? Or did Rihanna's score high-er? Vote below!
Rihanna or Lady Gaga: Whose weed costume was best? View Poll »