The pair - mainstays of ITV's Dancing On Ice - will be seen in an episode to help a "well-loved" character make a marriage proposal.
"It is amazing being here," said Dean. "We have jumped from watching Emmerdale on TV to being in a scene. From the screen to the scene. I'm loving it."
Skate partner Torvill added: "I can't wait to watch the episode that we are going to be in. It will be surreal sitting at home watching it."
The soap's producer Laura Shaw said: "We are delighted to welcome Jayne Torvill and Christopher Dean as our very special guests to Emmerdale. Torvill and Dean certainly promise to bring the Christmas magic sparkle to the show."
Emmerdale continues weeknights at 7.30pm on ITV1 and ITVX.