Lady Gaga Goes Down HARD During Live Show

4/11/2011 7:45 PM PDT

[VIDEO] Lady Gaga Falls Down HARD During Live Show

Lady Gaga fell off a piano and landed head first on the cold, hard stage in Houston yesterday during a live concert ... and the whole thing was caught on tape. 

Gaga appeared to be unfazed by the fall -- getting right back up and singing her face off like nothing happened.

Total. Pro.