He's not just a music legend, Lou Adler is also an L.A. Lakers mega-fan -- who's plugged in to all things Purple and Gold -- and the guy tells TMZ Sports 'Melo ain't gonna sign with the Lake Show.
Of course, Adler is the guy who's always sitting courtside with Jack Nicholson -- and together, they're considered Lakers royalty.
So, if anyone really knows what's really going on behind the scenes -- it's this guy ... who, unfortunately for Lakers fans, didn't sound too optimistic about signing Carmelo Anthony.
In fact, he thinks Anthony's gonna steal another HUGE Lakers star and take him back to NYC.
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