News: Jay-Z, Beyonce and... Rihanna - rumors suggest

Rihanna is Jay-Z's newest artist and she's also climbing up the charts with her sophmore album. Sources say that the singer and her mentor are becoming extremely close, too close for Beyonce.

Rumors are beginning to circulate that Rihanna is becoming uncomfortably close to her mentor Jay Z. And that closeness reportedly bothers Jay Z's longtime girlfriend Beyonce. As one entertainment insider tells us, "Rihanna is desperately trying to steal Beyonce's look, her style, and even her sound ... I wouldn't be surprised if now she's trying to steal Beyonce's man."

At a recent NJ Nets game, Beyonce's frustration boiled over. According to a fan seated near the couple, Beyonce lost her cool when Jay Z received a 15 minute telephone call from Rihanna. Beyonce reportedly yelled out "why do you keep talking to her" and stormed out of the arena before Jay Z had a chance to explain.

Beyonce may truly have something to worry about. Last month, while Beyonce was in Los Angeles accepting a star on Hollywood's Walk of Fame, Jay Z was reportedly in New York City wining and dining Rihanna. While the two did attend a series of business meetings, they also had dinner for two at Cipriani's and later that evening the pair was spotted entering one of the private rooms at Jay Z's 40/40 club. Our spy tells us that Jay Z and the young singer were all alone in the screened off room for more than four hours.

One of Jay Z's representatives admitted that the Jigga Man and Rihanna have been spending a lot of time together. But the rep vehemently denied that anything is going one between the two. According to the rep, "it takes a lot to groom an artist and Jay's just putting in the work."

Does Jay-Z have himself a new R&B hottie? The rumor mill suggests that Jay-Z and his girl Beyonce are on the rocks courtesy of the mogul's new 18-year-old crossover sensation, Rihanna.

Rihanna, whose current single "S.O.S." just clocked its third week atop Billboard's Hot 100 Singles chart, was also spotted out with Jay-Z in New York last month while Beyonce was in Los Angeles accepting a star on the Hollywood Walk of Fame for her former group, Destiny's Child.

Also, Jay and Rihanna reportedly attended business meetings as artist and label head, dined together at Cipriani's and were seen entering one of the private rooms at Jay Z's 40/40 club, where both reportedly stayed behind doors by themselves for more than four hours, according to a source.