David Spade — Hey Reese Witherspoon … You’re NOT THAT FAMOUS!

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Reese Witherspoon learned the hard way — if you have to tell someone, “Do you know who I am” …  you”re NOT as famous as you think you are, this according to David Spade.

Spade was leaving Boa Steakhouse in Hollywood last night when we asked if there”s ever a good time for a star to drop the “I”m a really big deal” schtick ( a la Reese) … and the “Rules of Engagement” star gave it to us straight.

“If you have to explain to someone you”re famous, then you”re technically not that famous.”