The 30 year-old appeared with First Lady, Michelle Obama, at an event for military families and said that she has only just started to consider possible wedding dates.
Simpson told ETOnline.com: 'I am planning a wedding, I mean I'm starting to. I hadn't started until two days ago, I was like 'OK, I am going to jumble around three dates before the end of the year and see what fits for everybody in my life'. So we'll see what happens, but I know that I'll definitely be married by the end of the year.'
Jessica performed a rendition of God Bless America for about 250 military families at Coors Field in Denver.