Britney Spears Playing Through the Pain ... Sorta [TMZ TV]

4/30/2015 6:00 PM PDT

Britney Spears -- Playing Through the Pain ... Sorta (TMZ TV)

TMZ TV

Britney Spears went boom during one of her recent shows in Vegas -- but like a true pro, she toughed it out and somehow managed ... to keep on lip syncing.

And it was totally horrifying for the audience -- or maybe exactly what they expected.