• 20 Celebrity Hair . New Styles

Celebrity hair: Demi Lovato The US X Factor's Demi Lovato is also a fan of the topknot, twisting her hair into a sky-high bun for a photocall in New York on 20 September.

Celebrity hair: Caroline Flack The Xtra Factor's Caroline Flack has dark roots showing in her new blonde hair as she leaves the ITV studios in London on 17 September.

Celebrity hair: Nicola Roberts Nicola Roberts adds a pink rinse to her hair at the JW Anderson for Topshop party in London on 17 September.

Celebrity hair: Nicola McLean Draping her Barbie-style long blonde hair over one shoulder, Nicola McLean celebrates her birthday in London on 18 September.

Celebrity hair: Jennifer Hudson Performing at a party in New York on 18 September, Jennifer Hudson goes for volume at the crown of her long, wavy hair. Share your view

Celebrity hair: Sarah Harding With her hair pulled back into a low ponytail, Sarah Harding looks chic as she arrives at the UK Lingerie Awards in London on 19 September.

Celebrity hair: Kate Moss Kate Moss goes for blonde bombshell glamour with wavy centre-parted locks at Milan Fashion Week on 19 September.

Celebrity hair: Pink Pink shows off her undercut and peroxide quiff on a day out in New York on 19 September.

Celebrity hair: Kim Kardashian Working this season's topknot, Kim Kardashian arrives at an E! channel event in Sydney on 19 September

Celebrity hair: AnnaLynne McCord AnnaLynne McCord adds a long, straight hairpiece to her sophisticated up-do for a fashion show in LA on 20 September.

Celebrity hair: Jennie Garth Beverly Hills, 90210's Jennie Garth goes back to the 80s with crimped hair at a party in LA on 20 September.

Celebrity hair: Joanne Froggatt Downton Abbey's Joanne Froggatt works waves in her blonde hair at the Emmy Awards in LA on 21 September.

Celebrity hair: Taylor Swift Taylor Swift sweeps her wavy blonde hair over one shoulder at the iHeart Radio festival in Las Vegas on 22 September.

Celebrity hair: Carly Rae Jepsen Carly Rae Jepsen smiles for photographers at her record release party in LA on 20 September, with straightened hair and blunt fringe.

Celebrity hair: Claire Danes Glowing mum-to-be Claire Danes accepts her Emmy Award for Best Actress in LA on 23 September with shoulder-length golden blonde hair.

Celebrity hair: Danielle Harold EastEnders' Danielle Harold attends the Inside Soap Awards in London on 24 September with her peroxide blonde hair in a stylish up-do.