The 18-year-old has adopted the track, which aired on Ryan Seacrest's radio show earlier this week, as her 'new jam'.
Writing on her blog, she said, 'Oh Em Gee! Just got the new Britney Spears song on iTunes hold it against me! It is my new jam! Obsessed! Can't quit dancing on set! Go check it! (sic)'
And Miley is not the only fan. Britney's Twitter page was flooded with comments from impressed followers, to which she replied, 'Seriously, I have the best fans ever. I love you all so much!! Everything I do is for you! xoxo Brit. (sic)'.