Margot Robbie is starring in the biopic as fallen ice princess Tonya Harding, who allegedly schemed with ex-husband Jeff Gillooly and one of her bodyguards, Shawn Eckardt, to attack Kerrigan at the U.S. Figure Skating Championships in Detroit, Michigan in 1994, a month before that year's Winter Olympics.

Nancy was left with a bruised leg and forced to withdraw from the competition, while Tonya won a silver medal.

Now Deadline has revealed that 24-year-old Caitlin has joined the cast as Nancy. The little-known actress, who shares a striking resemblance to the skater, has previously appeared in movies including Paper Town and the upcoming Rules Don't Apply, as well as NBC show Timeless.

The outlet also reports that 10-year-old actress MCKenna Grace will star as a young Tonya in the film, while Bojana Novakovic has been cast as her coach Dody Teachman, with the new additions also joining Avengers star Sebastian Stan, previously revealed to be playing Gillooly in the movie.

Production has already begun on the film, with Australian actress Robbie seen in character as Tonya on the Atlanta set of the film on Saturday (21Jan17). While Robbie was previously seen practising her moves on the rink, this was the first time she has been seen in character, off skates. She was wearing a short blonde wig, with an 80s style red checked shirt and matching red trousers.

Harding, now 46, still denies any role in the ambush. She struck a plea deal with prosecutors in March, 1994 and pleaded guilty to conspiring to hinder prosecution. She was handed three years' probation and ultimately banned from the U.S. Figure Skating Association for life.

Gillooly was sentenced to two years behind bars for racketeering, after a judge ruled he was the mastermind behind the vicious plot.