Her long, dark locks have mesmerized moviegoers for years -- from "Labyrinth" to "He's Just Not That Into You."
Now, presumably for her next role in 2010's "What's Wrong With Virginia," Connelly has lightened her hair up significantly to a pale blonde.
Those dark roots come back quickly, Jennifer -- trust us, we've been there! Luckily, we're certain the star has a stylist on call for touch-ups.
What do you think of the look? Click through our gallery of stars who went blonde below!