The American Pie star debuts her new blonde look in It's Not You, in which she stars alongside Steve Guttenberg and comedian Jeffrey Ross.
And the sexy star is thrilled she got the chance to try a different style - revealing she has always been banned from touching her famous hair.
She tells WENN, "This is the first time I've been able to change my look. (Movie bosses) usually can't see past me as a brunette."
The actress hopes the new role - in which she romances both Guttenberg and Ross' characters - will show casting directors she's more versatile as an actress, even if it means drastically altering her appearance.
Elizabeth adds, "I'd definitely like to try different looks. It totally depends on the role, of course. But my favourite actor is Gary Oldman. He looks so different in all his movies, you can't always tell it's him."