Chris Brown & Rihanna Get Blunt at Grammys Afterparty

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and Chris Brown“s new romance has already gone to pot — the couple celebrated CB”s zero Grammy wins by hitting up a Hollywood nightclub last night … and lighting up what appears to be a joint.

Chris and Rihanna — who won her 7th Gram last night for her “We Found Love” music video — dropped by Supperclub for a private party … and according to sources inside the venue, the whole place was filled with pot smoke.

It”s the first time the couple”s been together on Grammy day since 2009 … and we all know what happened then.

And there”s this — Chris was shot driving away from the club with Rihanna in the passenger seat at around 3:20 AM … which would be a big issue if he”s driving under the influence of pot — a big issue because he”s on probation for beating his passenger to a pulp.