Singer Katy Perry recently stated that she is “obsessed with the aliens” and blithely added, “I am sure that they will come to earth one day!” If this sounds weird enough, we take you on an interesting voyage to celebrities’ obsessionville. Cameron Diaz-obsession: doorknobs: This H’wood girl open doors with her elbows to avoid touching germ-infested doorknobs. She is known to scrub her Hollywood home scrupulously and washing her hands ‘many times’ each day. ‘I’m not scared of germs,’ she explains, ‘I’m just not into other people’s fluids.’ Billy Bob Thornton-obsession: repetition: Eccentric actor Billy Bob Thornton admits that he has a penchant for repetitive compulsive actions. The ‘Bad Santa’ star became very close to late rocker Warren Zevon after discovering that- they both suffered from this obsession. ‘He saw me at the mailbox taking my mail out and putting it back three times, and he said, ‘You have that too, huh?’ I adored him from then on,’ he confessed. David Beckham-obsession: symmetry: The England soccer captain has his own tactics for keeping the Beckham household in World Cup class. Not only does he insist on lining up his shirts according to their colour, his wife Victoria says he is obsessive about symmetry: “If you open our fridge, it’s all co-ordinated down either side. We’ve got three fridges-food in one, salad in another and drinks in the third. In the drinks one, everything is symmetrical. If there are three cans of soft drink, he’d throw one away because it has to be an even number.” Alec Baldwin-obsession: cleaning: The ‘Aviator’ star admits that over the years he’s developed a huge fixation for cleaning things around his home. He says, ‘I come home and I’m like, ‘Did somebody move that book?’ I just notice everything.’ Baldwin adds, ‘I’ll have to catch a plane, like I’m in a hurry to go somewhere, and I’m in my kitchen rinsing out the glasses. I have a housekeeper who can do that, and I’m sitting there cleaning the glass.’ John Abraham-obsession: bikes: John has, at times, given more importance to his bike than Bipasha (maybe that was the reason behind their separation). He’s also a regular shopper of helmets, and has different helmets for each day.