Blake Griffin lit it up at his comedy show Thursday night in Hollywood ... but rumored GF Kendall Jenner kinda stole the show -- even though she never got onstage.
Blake -- bad knee and all -- toughed it out to raise funny money at "Comedy by Blake" ... bringing in big-name comics like John Mulaney, Norm Macdonald and Whitney Cummings for the charity event at The Avalon.
Griffin once again proved he's got jokes -- the crowd ate it up.
Cummings gave the Clippers superstar high praise for his mic work -- "Everyone's like, 'Oh, he's funny for a basketball player. I'm like, 'No, he's like funny for a comedian!'"
But none of the comics could hold a candle to Kendall ... whose sheer black top SLAYED the red carpet before the show.
Nothing funny about that joint. Just pure hotness.
FYI, a lot of Blake's NBA bros came through too ... including teammates DeAndre Jordan, Lou Williams, Wesley Johnson and Sam Dekker.