LADY Gaga is reportedly in a rage after learning Kim Kardashian has poached her designer.While the singer is convalescing following hip surgery, it’s claimed Kim has been busy convincing Nicola Formichetti to work for her.The reality TV star apparently bombarded Gaga’s collaborator with emails and even took a last-minute flight from Miami to New York to meet up with him.And her efforts have paid off, according to US reports.It’s alleged the Poker Face chart-topper – who was forced to axe the remainder of her ‘Born This Way Ball’ tour after a case of joint inflammation condition synovitis left her unable to walk – has not taken well to Kim encroaching on her territory.A source told Ahlan! mag: "Gaga was fuming when she discovered Nicola was working with Kim. Agencies