The singer was at Nobu restaurant in London to promote her new 'Promise' rings which are being launched in conjunction with her latest single Promise This.
The rings, designed for luxury jewellery firm de Grisogono, are made to be worn on the little finger and feature blackened silver with the word 'Promise' cut out. They are expected to cost around £794 each.
The 27-year-old recently divorced footballer Ashley Cole amid allegations of cheating. She had Girls Aloud band-mates Kimberley Walsh and Nicola Roberts on hand for support and was later spotted leaving the event with her younger brother Gary.