Hamm and Paré get into character for Mad Men in Maui. Plus: Reese Witherspoon, Halle & Tom, Prince Charles and more


Rock the vote! Katy Perry – who celebrates her 28th birthday today – gets the crowd energized while performing at a campaign rally for President Barack Obama Wednesday night in Las Vegas. "The PRESIDENT gave grandma and I unforgettable sour outs & now I am officially 28!" she Tweeted. "Best. birthday. ever."