Rearranging the letters of 'The singer Britney Spears' gives:
She's, er, a pretty big sinner
(by David Bourke by hand) (2000)
Other related anagrams without their own page:
"Britney Spears as a mother" -> "Oh Pretty, brains are a mess." (by Rodney Koodray Jr) (2007) (pending approval)
"Kevin Federline and Britney Spears" -> "Final break is presented in very end." (by Hans-Peter Reich) (2006) (pending approval)
"Britney Spears lost her virginity at fourteen years old" -> "Noisy stereotype trailer-trash duly given a first boner." (by David Bourke using Anagram Genius) (2008)
"1. Britney Spears 2. Lindsay Lohan 3. Paris Hilton" -> "1. Lady in rehab 2. Lass in therapy 3. Lost in prison." (by Scott Gardner) (2007) (pending approval)
"Britney Spears sued by former "manager"" -> "Famous singer as pretender, 'merry' baby!?" (by Aronas Pinchas) (2009) (pending approval)
"Britney Spears is pregnant" -> "Beginner as nasty stripper." (by Dhrumeel by hand) (2006) (pending approval)
"The US pop singer Britney Jean Spears" -> "Use porn? Ah, spy jet-set beginner Paris!" (by Mick Tully using Anagram Genius) (2007) (pending approval)
"The US pop singer Britney Jean Spears" -> ""Panties?", Burghers jeer, "Spy NO panties!"" (by Mick Tully using Anagram Genius) (2007) (pending approval)
"The US pop singer Britney Jean Spears" -> "Jester: "No panties? ping her bare pussy!"" (by Mick Tully using Anagram Genius) (2007) (pending approval)