WHAT?!?! Buffalo got quite the treat tonight.

Brett Alan was on stage doing some stage announcements and gets off and says to us "Miranda Lambert is here".

It's super cool she was there, but really it's no major surprise. Her boyfriend, Anderson East was opening up the show for Chris Stapleton tonight in Buffalo at Darien Lake. She walked right though the crowd and to the sound booth during his set, nearly unnoticed. When she walked away from the sound booth, it seemed like the entire place finally realized she was there. Miranda walked from the crowd by the sound booth (of course with tons of security) to the stage and she hopped right on there to sing happy birthday, as Anderson turns 30 tomorrow.

THEN SHE COMES OUT TO SING WITH STAPLETON!!!