Rihanna has pulled out of her planned X-Factor performance this weekend. According to an insider the “Umbrella” singer has caused quite a shake up and producers aren’t very enthused. According to Heatworld, Beyonce will rock the stage at the shows finale as planned accompanied by Westlife. The “If I Were A Boy” singer will perform with Alexandra, an X-Factor finalist, while JLS will perform with Westlilfe. According to an insider who spoke with the UK’s Mail On Sunday, Rihanna told producers she had to rehearse for her tour in the U.S. and didn’t have time for X-Factor. According to sources she only told them Thursday morning, just 48 hours before the appearance. Simon is said to be angry about Rihanna’s departure but feels it won’t affect the finale on Saturday.