Miley Cyrus wrote new break-up song Drive on Valentine's Day (14Feb13) as she struggled through a "hard time" in her own relationship with then-fiance Liam Hemsworth.

The couple had been dogged by rumours of an impending split for months before the singer/actress officially announced the end of the engagement last week (begs16Sep13), and the 20 year old admits she spent the most romantic day of the year in the studio, penning a track which alludes to the romance troubles she faced.

She tells Canada's Fashion magazine, "I wrote it while I was working on Valentine's Day - emotionally it was such a hard time.

"It is about needing to leave someone but not really wanting to completely cut yourself off from the relationship. It's a time when you want to leave but you can't. It's also about moving on."

Drive features on Cyrus' upcoming album, Bangerz.