Pieterse spoke with ET's Cameron Mathison after Monday's new DWTS, and the 21-year-old star opened up about the highly anticipated series, Pretty Little Liars: The Perfectionists, which was announced on Monday, and how it feels to finally be able to talk about it.
"I'm doing a pilot in January," Pieterse shared. "I'm so glad to announce it, actually I realized that I can announce it today, which I was kind of blindsided about."
After seven seasons of playing Alison DiLaurentis on the Freeform teen mystery drama, Pieterse says that she can't wait to get back into playing the character she's grown so familiar with.
"I love that I get to play Allison still," she said. "It's a character that's near to my heart for seven years and it's a fun new world."
On Monday's Dancing With the Stars, Pieterse and Savchenko scored a formidable 23 out of 30 for their Viennese waltz set to Rose Royce's "I'm Going Down," tying for second place on the leaderboard with Frankie Muniz and his partner, Witney Carson.
As for the hotly anticipated Perfectionists series -- based on the young adult books written by PLL author Sara Shepard -- Pieterse will be joining Janel Parrish, who is set to reprise her role as Mona.