The 27-year-old singer posted an excerpt from her forthcoming album "in celebration of 420", reported Huffington Post.
420 is an annual holiday celebrated by marijuana enthusiasts around the world.
Rihanna recently spoke candidly about controlling her public image via social media, admitting that she doesn't "give a dick" about privacy anymore.
An unreleased duet between Chris Brown and Rihanna, 'Put It Up' recently surfaced online.
Rihanna previously unveiled the powerful music video for her new song 'American Oxygen'.