Movie stars ain't the only ones fallin' all over themselves to work with LeBron now that he's in Hollywood ...
YG tells TMZ Sports he's absolutely open to a music collab with LBJ if the King wants to do one.
"I f*ck with LeBron," YG says. "Hell yeah, that n**** can get a YG feature!"
One problem ... YG says it probably ain't gonna happen -- 'cause Bron's too old for rap dreams.
What YG may be forgetting is that LeBron has dabbled in rap before -- in fact, TMZ Sports has Bron's tracks from a 2014 session with his pal, Sian Cotton .