Rihanna and A$AP Rocky hit the studio Friday night … adding more fuel to the rumor mill she’s gonna drop another album!

She’s been seen at the L.A. studio several times recently, so the seemingly endless wait for more music may be coming to an end.

RiRi was there with BF A$AP, who is mounting an aggressive defense to weapons charges. He’s been hit with felony firearms charges for allegedly shooting A$AP Relli. Relli has filed a civil suit against Rocky as well.

Rocky’s new lawyer, Joe Tacopina, told TMZ Friday, “Rocky didn’t commit a crime. It was an extortion attempt by a former associate, who threatened to make false criminal accusations if Rocky didn’t pay him.”

Tacopina tells us he has 2 eyewitnesses who back Rocky’s story … not only that Relli wasn’t hit by bullet fragments, but that no shot was even fired. In other words, Tacopina says Relli has made up the story in a “get rich quick scheme.”