Katy Perry Russ-les up lyrics

The singer has been writing down her feelings in a book since her relationship with Russell Brand became strained.

According to pals, she has now started putting her heartbreak into songs as a way of dealing with her emotions.

A source said: "Ever since problems started to emerge, she penned her thoughts in a diary which she goes back to to draw upon for lyrics for her songs.

"She has always said that writing is almost a form of therapy for her and she would often be found in her dressing room on tour writing in her diary.

"She spent a lot of time in Hawaii over Christmas writing lyrics to two of her latest tracks." Russell filed for divorce at LA Superior Court last Friday, citing "irreconcilable differences".

The couple who met at the MTV Music Awards in September 2009 were married for just 14 months.

The songs for the new album won't be the first time that Katy has sung about one of her exes.

She documented Travis McCoy's alleged drug abuse in her album track, Circle The Drain.

The lyrics went: "Thought I was the exception/ I could rewrite your addiction/ You could have been the greatest/ But you'd rather get wasted/ You fall asleep during foreplay/ 'Cause the pills you take are more your forte."

At least Russell's teetotal.