Jennifer Lopez says sleep helps her looks to stay fresh.

The singer is now 45 years old, but she is still one of the hottest properties in the pop scene.

Speaking to OK!, the US star admitted that getting forty winks is key to keeping on top of her looks.

Lopez said: "Sleep is my weapon. I try to get eight hours a night. I think what works best [for anti-ageing] is sleep, water and a good cleanser."

The 'Booty' star added that she tries to rest in the evening to ensure she isn't feeling tired:

"I think it's very, very important. You know, because I have the twins and because I work a lot, it's a very, very important thing to take care of myself."

Lopez meanwhile released her eighth album 'A.K.A.' in June.

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