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"Many artists would consider themselves lucky to reach their seventh album, but for Rihanna, it&amp;#039;s a feat she managed somewhat effortlessly - and quickly.  What&amp;#039;s more, she&amp;#039;s continued to reach new heights with her latest set Unapologetic, which is on course to be her first number one record in America. Meanwhile, the LP&amp;#039;s lead single &amp;#039;Diamonds&amp;#039; has now topped the charts on both sides of the Atlantic, meaning Rihanna has matched Madonna&amp;#039;s US chart-topping record.     To celebrate such an impressive chart milestone, we&amp;#039;re asking Digital Spy readers to vote for which of her number one singles is the best. We&amp;#039;ve included songs that hit the top spot in the US and the UK as well as tracks she&amp;#039;s featured on, just to keep things interesting.   Click through our gallery of Rihanna switching on Westfield Stratford&amp;#039;s Christmas lights below:  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/music/news/a440111/rihannas-number-one-singles-which-is-best/>