Mila Kunis just proved she’s not only sexy, she’s also smart and sassy. The actress laid the smackdown at a press conference in Moscow -- and she did it in Russian!

The Friends With Benefits star, who moved to California from Ukraine at age 7, schooled a Russian reporter at a press conference when the reporter asked Justin Timberlake the question that everyone has been dying to ask: why is he choosing to focus on movies over music?

"Why movies? Why not?" Kunis quickly jumped in, answering in Russian. "What kind of question is that? Why are you here?"

Ouch! (And hot!)

If Kunis ever changes her mind about acting, she doesn't need to worry about being out of a job. After the exchange, Timberlake joked that he’d appointed her to be his personal bodyguard. Hey, someone has to watch that sexy back!

While watching Kunis speak Russian to reporters, be sure to check out Timberlake's confused expression. It's priceless!