Melanie Griffith's Wedding Ring -- It's Hard to Let Go of Antonio Banderas

Melanie Griffith may have filed the divorce papers, but the symbol of marriage to Antonio Banderas is still firmly in place.

The "Working Girl" star left a hair salon in Beverly Hills on Monday, sporting what looks like a wedding band on her left ring finger.

As TMZ first reported, Griffith pulled the plug on her marriage to Antonio after 18 years. Griffith wants spousal support. She's also asking for custody of their minor child ... who turns 18 in September.