Adele's honest album title

Adele called her album '21' because she wanted to be "honest" rather than "clever".

The 'Rolling In The Deep' singer named both her albums after the ages she was when she made them - '19' and '21' - saying the titles best summarised her life at the time.

She explained to Clash magazine: "I didn't want to call this record '21' at first; I thought it was really obvious, I thought everyone would be like, 'Ooh, she ain't got much of an imagination, has she?'

"Then I listened back to '19' and read reviews from live shows and stuff like that, and suddenly felt like that it is properly two years later, and I do feel like I've really become an adult in those last two years.

"So it was really an obvious title, but I think being obvious sometimes is right, rather than trying to be clever."

The star - who is now 22 - worked with super producer Rick Rubin on '21', and said she initially wanted to do so because they have such different musical backgrounds.

She added: "I didn't think we'd fit in together at all. That's why I was so intrigued to do it, because when he said he wanted to do it, I was so like, 'Eh?'

"It would be an expensive mistake if it didn't work, but it did work and it was brilliant. It was just too much of a good opportunity to pass up really. He was just so wise."

'21' is released on January 24.