Tyrese -- OUT COLD At D.C. Nightclub [Photos]

Tyrese wasn't kidding when he said he fainted hard at a D.C. nightclub Friday -- and TMZ has the photographic proof.

We broke the story ... Tyrese went to the hospital Friday night, after he fainted inside The Park nightclub in D.C. during an appearance with his new TGT bandmates Tank and Ginuwine. He fell so hard he injured his arm.

These are pics of Tyrese before and after it happened. At first, the singer is totally fine, standing up and looking out at the crowd. The next moment he's conked out, surrounded by people trying to wake him up.

Luckily, Tyrese was fine after the incident -- minus the busted arm -- explaining he fainted due to pure exhaustion ... after running himself ragged promoting his new album.