Kim isn't keen on women visiting West's dressing room when she isn't around, with the 31-year-old socialite becoming extra wary of Rihanna after she was romantically linked to her brother Rob Kardashian in February, reported Sun online.
"Kim is incredibly protective of Kanye and doesn't want any women near him unless she is there - even his friends. Rihanna wasn't even allowed to go into his dressing room without Kim being there. The fact she was linked to Kim's brother probably didn't help," a source said.
"It's crazy but Kim knows the attention Kanye gets when he's on tour - and she doesn't want any competition."
Kim and West have been inseparable since going public with their romance, with the reality star tweeting a pic of the rapper accompanied with the message: "I miss him."