Star's apology earns the star a C+
Singer says she's never postponed a concert before
US sources speak of problems on new album
Star has 13 concerts planned for the UK
Singer to play eight UK & Ireland concerts following hugely successful 2013 Super Bowl performance
Singer leads tributes for Obama's second term
'99 problems but Mitt ain't one', raps Jay-Z
From Destiny's Child to at least one naked breast...
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