Katrina Kaif has many reasons to smile. First her recent release "New York" became a huge success and now comes her birthday, which the British-born actress will celebrate with her entire family in London Thursday."I'm celebrating my birthday this year with my entire family, all my sisters who have flown down from all over, my mom who's flown down from Chennai and my brother who's a professional rock climber, " Katrina, who will turn 25, told through SMS."I was supposed to spend a long holiday with them last year during Christmas and New Year in London, but I had to cut my trip short because of my work schedule. So this year I'm specially taking time out for them and we are going to Italy for a family get together. I haven't had a break in almost two years, so I'm looking forward to this, " added the actress.Last year her birthday bash turned ugly when beau Salman Khan picked a fight with Bollywood superstar Shah Rukh Khan. So this ...