She accepted boyfriend Josh Duhamel's wedding proposal just before Christmas, but she doesn't want to make the happy news public until they have set a wedding date.
Apparently, she was showing off her four-carat diamond engagement ring at a pre-Christmas party at film producer Michael Bay's home on 15 December, but has kept it hidden ever since.
Duhamel's representative have denied the engagement news, but a friend of the couple tells Life & Style magazine, "They don't want to announce the engagement until they set a wedding date, but Fergie can't wait to marry Josh."