What better way to signal 'I'm back!' than with a glossy new 'do? Cheryl Cole shut it down yesterday when she unveiled a super-glossy, blonde dip-dye to announce the major news of her return to The X Factor UK. Chezza has never been one to shy away from experimenting with her locks, from the Girls Aloud cornrows circa 2003 to the big bouffants she showcased on The X Factor UK version 1.0 and the bigger-still backcomb she debuted at American X Factor. You name it, she's tried it. Check out her greatest hits below.