According to a post on CNN:
Hackers appear to have struck the singer’s Twitter account on Thursday, altering her wallpaper and posting the following tweets:
“I give myself to Lucifer every day for it to arrive as quickly as possible. Glory to Satan!”
“i hope that the new world order will arrive as soon as possible! -Britney”
The Illuminati wallpaper and offending tweets were quickly removed. #DontHackBritneySpears later appeared as a popular trending topic on Twitter.