The Firework singer is the latest artist to sell off the rights to her past hits - but what does that mean?
From Tom Cruise and Ellen DeGeneres, one sign you are really famous is when rumours star circulating that you do not allow your employees to look you in the eye.
BBC radio presenter Scott Mills has remembered some of of his favourite celebrity encounters from his time at Radio 1, as he prepares to move to Radio 2 in the autumn.
Ellie Goulding's famous friends have been helping her out as she prepares to become a mother for the first time.
Katy Perry appeared on "Jimmy Kimmel Live!," Monday, where she talked about the joy and surprises of motherhood.
Miranda Kerr has spoken of the relationship she enjoys with father of her son and ex-husband Orlando Bloom and his fiancée Katy Perry
The 'Roar' singer has lifted the lid on why she and Swift made up in the public eye last year.