John Stamos showed restraint Friday in West Hollywood ... after running into one of the hottest girls in Hollywood outside of a gym -- as far as we know he didn't bang her.
Vanessa Hudgens and Stamos crossed paths outside of the Nine One Zero Salon ... and John looked awfully happy to see the 25-year old smoke show.
Of course Stamos' charm didn't go unnoticed -- Hudgens looked real giddy during the exchange.
If only John's friend had been able to play it cool. Amateur.