Rihanna leaves manager Marc Jordan, joins Jay-Z

London (ANI): Grammy-winning pop singer Rihanna has left manager Marc Jordan to join Jay-Z's Roc Nation Management. Rihanna said she's "excited to take this next step in my career," reports the Mirror. Jay-Z signed Rihanna to Def Jam in 2005. The two won a Grammy in 2008 for the hit song 'Umbrella'.

She's released four albums and plans to release her fifth CD 'Loud' on November 16. Earlier this year, the pair picked up two Grammys for the rap song 'Run This Town', which also featured Kanye West.

The 22-year-old is also launching a new company called Rihanna Entertainment. She says it will "merge all of her businesses, including music, film, fragrance fashion and book ventures."