DeSean Jackson's confidence level is THROUGH THE ROOF these days ... 'cause it appears the guy was hollerin' at Rihanna outside an L.A. nightclub this weekend ... and TMZ Sports has the footage.
The Washington Redskins wide receiver -- who just signed a brand new $24 million contract -- was hangin' out with The Game at Lure nightclub in Hollywood ... when RiRi's car pulled up.
Jackson, sportin' a black and blue bandana, went right up to the window and started chattin' up the singer ... with Game actin' as a wingman.
Rihanna eventually rolled up her window and left -- without Jackson -- but D-Jax seemed pretty happy about the encounter ... at least, judging by the HUUUGE smile on his face!
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