Dannii Minogue, Kate Moss, Jon Hamm: Celebrity pictures January 17

Today's celebrity pictures include Aussie star Dannii Minogue being caught unawares by a tennis ball to the head during the 2012 Australian Open Tennis welcome ceremony in Melbourne, and Hollywood stars Vanessa Hudgens and Josh Hutcherson attend their premiere of Journey 2: The Mysterious Island in Sydney.

Meanwhile, Twilight actress Ashley Greene films her guest appearance on US series Pan Am in New York, and Mad Men stars Jon Hamm and Elisabeth Moss pose with 30 Rock actor Jack McBrayer at the NBC Universal Golden Globes afterparty.

In Milan, a suave Gary Oldman and Adrien Brody take to the catwalk for Prada for Fashion Week and in London, Kimberley Walsh happily signs autographs after her performance in Shrek: The Musical at the Theatre Royal, and supermodel Kate Moss celebrates her 38th birthday at a Japanese restaurant.