Miley Cyrus's hit single ‘7 Things’ - which appears on her current album ‘Breakout’ - was written about her split from Jonas Brothers singer Nick Jonas.

Miley Cyrus's ‘7 Things’ about Nick Jonas

The catchy track, which features the young star detailing the seven things
she hates about an unnamed ex-boyfriend, includes the lyrics, "Your friends,
they're jerks/When you act like them, just know it hurts."
Miley parted ways with Nick in 2007 after two years together.
Earlier this year, 15-year-old Nick insisted the song wasn’t about him,
saying: “My friends aren’t jerks.”
However, Brett Ratner - who directed the video for ‘7 Things’ - revealed the
necklace Miley wears in the video was given to her by the boy she sings
about.
He said: "She is wearing his diabetes or medical necklace. You can tell by
the lyrics that they're very personal. The stuff she talks about in the
video is clever and emotional and fun at the same time."
Nick has Type 1 diabetes and campaigns to raise awareness about the disease.

Image WENN