because Dr. Luke, the rad dude responsible for this song, has a pretty prolific reputation for engineering pop songs that make the careers of some pretty huge artists:

• Miley Cyrus, “Party In the USA”
• Katy Perry, “Hot N Cold” and “I Kissed A Girl”
• Kelly Clarkson, “Since U Been Gone”
• Avril Lavigne, “Girlfriend”
• Sugababes, “About You Now”
• Britney Spears, “Circus”
• Pink, “U + Ur Hand”
• Adam Lambert, “For Your Entertainment” (we all have our creative misfires!)
• Lady Sovereign, “Love Me or Hate Me (Fuck You)”

Basically, Dr. Luke is responsible for the gaying of popular music in the aughts. Thanks, Doc.