Taylor Swift and Keith Urban Sing ‘Shake It Off’ At Reese Witherspoon’s Party

Taylor Swift, 26, and Keith Urban, 48, rocked the hell out of Reese Witherspoon‘s 40th birthday party at Warwick in Hollywood on March 19 with a very special performance! The unlikely duo gave an amazing rendition of Taylor’s smash hit “Shake It Off,” and of course the crowd went wild!