06/08/2011 at 01:45 PM EDT
was expected to kick butt as Catwoman in the latest Batman
movie, and apparently she's taking the role
While filming The Dark Knight Rises
, the actress, 28, accidentally gave a stuntman a black eye when she hit him with the butt of a gun prop during a fight scene.
"Anne was mortified," a source on-set of the Christopher Nolan-directed film tells U.K.'s The Sun newspaper
. Added a source: "It was all in good humor, but the poor guy took quite a pummeling."
So how did the starlet apologize?
A silver pen – with a special message: "Remember no one packs a punch like Anne," the engraving reads.