For once it was Girls Aloud’s blonde beauty who was the sensible one as bandmate Nicola Roberts got more than a little worse for wear at Camden?s Gilgamesh last night.At one point, the redhead even suffered an accidental nip slip, smiling away as the photographers caught her shame on camera. The pair were there to help celebrate the venue?s third birthday, and by 11pm Nicola, 23, was downing drinks, dancing on chairs and stumbling around. By midnight, she had been packed off home.