Kenny G's wife files for legal separation

Kenny G's wife has filed for legal separation in their 20 year marriage ..

Lyndie Benson-Gorelick filed papers in L.A. County Superior Court -- citing "irreconcilable differences."

The couple has 2 sons.

There's a lot of money on the line.  There's a report Kenny is worth around $50 million.

There's one big sign the case is eventually headed to divorce court ... both Lyndie and Kenny have lawyered up with high-powered legal guns. Lyndie has Gary Fishbein, who has repped numerous celebs including Gabriel Aubry, Nikki Sixx, and Kenny has Laura Wasser, who has repped Britney Spears, Angelina Jolie and Kim Kardashian, to name a few.

Source: TMZ