Ke$ha's Tour Bus -- Emergency Room Pit Stop

Ke$ha's two tour buses made an emergency stop last night at the University of Miami hospital -- but TMZ has learned, it wasn't the singer seeking medical attention.

Ke$ha's rep tells TMZ, "A member of Ke$ha's band sustained a minor injury, was treated, released and feeling great."

The buses pulled in after Ke$ha's show at the Bayfront Park Amphitheatre -- and we're told, they remained parked there for hours while the singer's security team stood guard at the hospital entrance.