Gwen Stefani, 46, proved that her music is timeless by belting out her hit “Hollaback Girl” to the packed out Vanity Fair Oscars after-party on February 28. Dressed in that insanely hot red dress and backed by an amazing band, Gwen took a little break from cuddling up to Blake Shelton, 39, to do what she does best: sing the hell out of that song!