Shania Twain falls on stage during a performance in Chicago

Shania Twain had a moment during her concert in Chicago on Saturday night…she tripped and fell on her ass, but recovered quickly and finished strong.

The country music legend was singing his tune, “Don’t Be Stupid,” at Credit Union 1 Amphitheater in Tinley Park when he passed out while walking on stage.

The video, obtained by TMZ, captured the moment Shania fell to the floor, but continued singing, got back on her feet and polished off the song.

We’re told Shania didn’t seem injured at all … and continued to perform without rest.

Eyewitnesses also tell us the crowd didn’t react when Shania took her spill … apparently because she looked totally fine.