(Cover) - EN Star Style - Justin Timberlake thinks it is fundamental for denim to fit properly.

The 29-year-old singer-and-actor is one of the worlds biggest heartthrobs, and is also somewhat of a style icon.

The fashionable hunk launched his own clothing line William Rast in 2006, and it specialises in jeans for both sexes as well as offering stylish jackets and tops.

Justin thinks he has learnt how to create the perfect pair of denim for ladies, and they require wearers to be rather sculpted in the posterior department.

And if theres one thing Ive learnt about women and jeans, its that they like them to fit in the caboose area... he laughed during an interview with the British edition of Cosmopolitan magazine.

Justin also discussed his fashion heroes. The talented star thinks the 1960s group of male celebrities called The Rat Pack which consisted of smooth musicians such as Frank Sinatra and Dean Martin - capture the essence of the brand.

My fashion line William Rast is a little bit country, a little bit rock n roll. If the Rat Pack rode motorcycles, then they would be the perfect endorsement for it, he beamed. (C) Cover Media