The Kardashians aren't shy when it comes to collaborating - we've seen Kourtney, Kim and Khloe put their names to everything from fragrances to fashion lines and between those deals and the TV shows, the family earned a staggering US$65 million last year! Now word on the street Twitter is that the sisters could be joining forces with OPI. First up, Khloe tweeted: “Top secret meeting with my sisters for OPI.” And then, Kourtney said: “Amazing top secret meeting today with @KhloeKardashian at OPI!!! I am obsessed with their nail polish colours!” After questioning whether the girls should be sharing their "top secret" meeting plans on Twitter (?!) we promptly decided that the Kardashians are next in line to Katy Perry, Justin Bieber and Serena Williams. OPI is yet to confirm or deny, but would you buy it if they did kollaborate?