"I like the odd drink and definitely like a good party. But for me drugs don't go with the territory," the Sun quoted her, as saying.
Meanwhile, the Brit pop star is so touched by the letter of thanks from Princes William and Harry to her, that she is having it framed.
The letter from the young royals was an expression of their thankfulness to the singer for her performance at the memorial concert for their late mother Diana, Princes of Wales, at London's Wembley Stadium earlier this month, reports Contactmusic.
"I got a letter from the princes and it was just so sweet. It thanked me for coming and said I was great, which was lovely. I'm getting it framed," she said.