Alexandra Burke - Engaged??

Yesterday was X Factor winner Alexandra Burke's 21st birthday. She celebrated her birthday with family and friends at a dinner party at Japanese restaurant, Nobu Berkley, and then went on to party at her private birthday party at Shoreditch House till 4am in the morning, where she racked up a £10,000 bill!

She was spotted coming out of Nobu with a ring on that all important finger.....



Is Alexandra engaged?? Or is that just the Tiffany's ring she treated herself to for her birthday??