VIDEO: 'Harry Potter' Cast Practice American Accents

Now that Harry Potter has wrapped, the teenage cast finally got to try out their American accents.

In a clip with MTV's Josh Horowitz, Daniel Radcliffe, Emma Watson, Tom Felton and Rupert Grint all tried their hand at tricky American words like "Glenn Beck," "boo-yah," and the ever-tricky "mozzarella." Horowitz also made them express some questionable statements like, "Justin Bieber is the man!" and "Twilight blows."

Watson is enrolled at Brown University in Rhode Island, so perhaps she appreciates the practice. The new Harry Potter and the Deathly Hallows: Part 1 opens Friday in theaters. –AMY LEE