The West End and TV star is competing against Dani Harmer, Louis Smith and Kimberley Walsh on Saturday's (December 22) showdown for the Glitterball Trophy.
In the final, she will dance a Charleston, a jive and her own showdance, which all the celebrities have to perform.
The Charleston, which she last danced at Wembley, was her own personal favourite dance of the series. The jive has been picked out by the judges as the dance they want to see her perform again.
Van Outen has regularly topped the leaderboard during the series, but found herself in the bottom two for the second time in the semi-final.
Her pro partner James Jordan commented: "We did two of our best dances of the series on Saturday, so it's sad to know people haven't picked up the phone and voted."
Strictly semi-final - photo gallery: