Live from New York ... Lady Gaga Is NOT a Diva!

5/23/2011 6:35 AM PDT
She sang, she danced, she got in a 3 way with Justin Timberlake and Andy Samberg, but one thing we're told Lady Gaga didn't do on "Saturday Night Live" this weekend ... act like a diva.

Believe it or not, a source connected to the show tells us Gaga was very down to Earth from the second she arrived to the set to prep for the show.

We're told Gaga personally greeted everyone on the staff she worked with last year with a kiss ... hung out before and after rehearsals ... and even ate her lunch sitting on the floor while chatting up the crew.

Maybe she really was born this way.