Halloween is the one time of year when people can transform into anyone they want and that includes celebrities too. After channeling Milli Vanilli with husband Dwyane Wade last year, Gabrielle Union decided to take things up a notch and rock out as Gwen Stefani for Halloween this year. Complete with a blonde wig and Gwen's signature red tartan trousers, Gabrielle shared an Instagram video of her dancing to No Doubt's "I'm Just a Girl" on Saturday, and we must admit, she totally nailed it!
