Rihanna Halloween Costumes

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!

Chris Brown, a man already linked to violence and destruction on a regular basis, hit up Rihanna's Halloween party last night dressed as ... a stereotypical Islamic terrorist.

Here's the singer and his crew, Taliban style:

The 23-year-old and his pals donned beards, turbans and fake guns as they made their way to a TSA Watch List Greystone Manor in West Hollywood.

"Ain't nobody F--king wit my clique!!! #ohb," Chris tweeted, classily.

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