Ariana Grande sleeps nude because of her grandmother.

The 21-year-old singer admits she prefers to wear ''minimal'' or no clothes to bed, which is something her gran encouraged her to do.

She said: ''I sleep in very minimal clothing. My grandmother encourages nude sleeping.''

The 21-year-old - who is dating rapper Big Sean - also sometimes lets her dogs sleep with her because she loves the pooches so much.

She said: ''I have four pet dogs: Ophelia, Coco, Toulouse and Fawkes. I love animals more than I love most people. I'm a vegan as well.''

Ariana's name was listed in 'The Fappening' leaked nude photo scandal.

However, the 'Bang Bang' hitmaker denied the alleged images of her were genuine insisting her ''ass is a lot cuter'' than the one shown in the hacked images.

In the wake of the scandal, Ariana posted on Twitter: ''To every1 going on about my ''nudes'' & my ''m&g prices'' neither are real! my lil ass is a lot cuter than that lmao ... but forreal tho whoever thought those were actually me...... love u but I'm praying for u (sic)''

Among the victims of 'The Fappening'