The song will be one that represents a memorable time or experience in his or her life.
For these "best year of their lives" dances, we'll see a wide variety of dance types -- everything from the Viennese Waltz, Samba, Cha Cha and Contemporary.
Some of the celebrities have been having trouble with these new steps.
"It's the Foxtrot, but I'm a fox. Now I just got to trot. I got half of it," said D.L. Hughley.
Dancer Lindsay Arnold revealed she and her partner, boxing champ Victor Ortiz, will be doing the Paso Doble, while Mark Ballas said he and gymnast Aly Raisman will be doing Contemporary.
"It's my favorite style of dance, so this is the week I can kind of do the Mark Ballas thing, and get out of the box, and kind of show that Aly's taking this serious, and she wants to make a run for it," Ballas said.
In addition, all of the stars will face the challenge of having to perform a brief solo during their performances.
Ingo Rademacher and Kym Johnson will be dancing the Viennese Waltz, and Derek Hough and Kellie Pickler will be rocking the floor with a Rumba. But Hough has another woman he'll be partnering with on Tuesday: a young woman who is legally blind.
"Being a dancer, you would think that your eyes are extremely important, but she's found a way to dance and to dance beautifully," Hough said.
The dancing begins at 8 p.m. Monday on ABC7.