John Cena -- BREAKS NOSE ON LIVE TV ... From Knee to Face

Still think wrestling is fake??

WWE superstar John Cena -- star of one of the biggest movies in the country right now -- broke his nose during Monday Night Raw last night ... after Seth Rollins bashed him in the face with a flying knee.

Despite blood dripping from his honker, the "Trainwreck" star continued with the match

WWE doc Steve Daquino says Cena suffered a nasal fraction -- and explained, "He’s got quite a bit of displacement, so we sent him over to the local emergency room so he can be evaluated by the ears, nose and throat doctor who’s on call tonight and see what can be done to properly repair it."

Damn.

By the way, Cena ended up WINNING the match.