Kelly Rowland thinks Spanx are "every girl's best friend".

The former Destiny's Child singer - who swears by the body-shaping underwear - always likes to be comfortable on a night out and so she consciously avoids sky-scraper heels because they make her look "a whole lot of crazy".

She told BANG Showbiz: "Spanx are every girl's best friend, I am wearing Spanx right now. Always make sure you're comfortable in whatever you're going out in, it's so important.

"If you're going out in six-inch heels, make sure they're ones that you can last at least seven hours in. Because when you start walking like there is a watermelon between your legs because your feet hurt so much, you look a whole lot of crazy."

In terms of make-up, Kelly - who is currently a judge on the UK 'x factor' - advised a bright shade of lipstick can really make an outfit "pop".

Speaking at last night's (03.11.11) Cosmopolitan Ultimate Women of the Year Awards 2011 at London's Banqueting House - where she picked up the gong for Ultimate TV Personality - Kelly explained: "I always choose a great lipstick because it really makes an outfit pop.

"Even if you have an all-black outfit on and you pair it with a bright Pink or red lipstick or something, it looks great."