Bollywood actress Katrina Kaif was spotted at the Mumbai airport as the actress returned after celebrating her birthday in London. Katrina, who recently turned 35, flew to London to celebrate her birthday with family and close friends. The 'Tiger Zinda Hai' actress has recently completed Salman Khan’s 'Dabangg tour' in the US. The Bollywood hottie is said to resume shooting for her upcoming movie ‘Zero’ with Shah Rukh Khan. Earlier, Bollywood’s Badshah SRK had revealed Katrina’s look in ‘Zero’ on his social media account on her birthday with a delightful post.