Mix in hot weather, a big crowd and the inimitable, sultry Lady Gaga Rockefeller Center for a morning concert and you get heat exhaustion.

That was the scene Friday morning when the Office of Emergency Management had to call the Metropolitan Transportation Authority to ask for an air conditioned city bus to cool off the overheated Gaga fans.

No serious injuries were reported as the flaming rock star belted out her hits "Bad Romance" and "Alejandro".

Some rain did fall during the performance, but not enough to cool off the clamoring fans or their Lady.