Was Rihanna Caught With Cocaine At Coachella?

Rumors about Rihanna using cocaine at Coachella have been running wild online due to a picture that was leaked. 

Rihanna hasn't confirmed or denied the picture online, but she did hit her Twitter shortly after the rumors started to fly and had this to say.

So now the issue is in the court of public opinions.  Do you think Rihanna was dabbling in some illegal activities?