Tom Cruise is a real-life action hero on the set of his movies — but his ass is even realer … according to one of his co-stars. 

We got Annabelle Wallis — who starred alongside Tom in “The Mummy” this summer — and she confirmed 2 stories about him all in a matter of seconds.

She says it’s true that Tom saved her life while filming ‘Mummy’ when something got wrapped around her neck during a stunt. More recently, though, folks speculated he used a prosthetic booty in his 2009 Nazi movie, “Valkyrie” … and you can kinda see why.

Tom already debunked the “fake butt” rumors this week, and now Annabelle is backing that up … no buns intended.