08/03/2011 at 11:00 AM EDT
How do you say "don't mess with Mila" in Russian?
While answering reporters' questions at a press junket in Moscow for Friends with Benefits
last week, Kunis
proved she has a knack for sass – even when she's not acting.
After a Russian reporter asked costar Justin Timberlake
, 30, why he's focusing on his on-screen career over music, the actress, 27, who was born in Ukraine, rushed to his defense.
"Why movies? Why not?" she replied in Russian, before a translator could step in. "What kind of question is that? Why are you here?"
Her snappy retort was met by laughter and cheers from the crowd – and a new job title from her costar.
"[She] is my bodyguard," Timberlake joked.