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4 January 2012, 14:59
The 'Tik Tok' star admits she still gets exited hearing the pop superstars' track 'Till The World Ends'.
Ke$ha has admitted that she still loves hearing Britney Spears sing 'Till The World Ends'.
The 'We R Who We R' singer penned the track for the 'Baby One More Time' and believes it will never get old.
"That song just came on the radio and I have to say, I love hearing Britney Spears sing my lyrics, every single day. It never gets old. I get so excited," she told MTV News.
The track was released as the second single on Britney's seventh studio album 'Femme Fatale' which also produced the hits 'Criminal' and 'Hold It Against Me'.