Lady Gaga "Fuming" At Kim Kardashian For Working With Her Fashion Designer?

28 February 2013, 10:11 | Updated: 28 February 2013, 12:25

The 'Judas' singer is said to want to keep Nicola Formichetti all to herself.

Lady Gaga has reportedly been left "fuming" by Kim Kardashian after the reality star started working with fashion designer Nicola Formichetti.

The 'Marry The Night' singer, who has worked with the Italian/Japanese designer regularly over the past few years, is said to be unhappy after the Keeping Up The Kardashians started striking up a relationship with the MUGLER creative director.

Gaga is currently recuperating at home after having surgery to repair a tear on her hip, while Kim is said to have been emailing the designer in recent weeks and even reportedly flew out to meet him in New York.

"Gaga was fuming when she discovered Nicola was working with Kim," a source told Ahlan! magazine. "She's fiercely protective of the people she works with and she's always been determined to have Nicola all to herself."

Check out a picture of Lady Gaga from Twitter earlier this month below (Credit: Twitter):

The 'You & I' singer underwent surgery last week (20th February) after being forced to cancel the remainder of her 'Born This Way Ball' world tour, and posted a heartfelt letter to her fans after leaving hospital.

Lady Gaga is widely expected to release her new album 'ARTPOP' this autumn after teasing the record for several months now.