Tim McGraw -- Bitch Slaps Female Fan During Concert (UPDATE: NEW VIDEO)

Tim McGraw ferociously slapped a woman in the face during a concert Sunday ... after she appeared to aggressively rip his jeans.

TMZ got video of Tim's concert at Aaron's Amphitheatre at Lakewood in Atlanta. You see him walk into the crowd and a sea of hands engulfs him as he sings, "Truck Yeah."

Look closely ... you see a woman slap Tim twice ... first on his knee and then she goes in a second time.

Tim then smacks her.

Tim's rep tells TMZ, "Tim was singing out in the audience and someone firmly grabbed onto his leg and wouldn't let go as he was moving through the crowd.

The rep says, "He instinctively swatted to try to keep them from ripping his jeans (which they succeeded at doing!), and so he could get to more fans who could slap hands with him before the end of the show."