It was Disney Night on Monday's DWTS, and the Pretty Little Liars star donned a red wig and a teal gown for a Little Mermaid-themed rumba with her pro-partner, Gleb Savchenko.
Before their performance, however, Pieterse shared an update on her ongoing effort to get in shape and live healthy in a pre-taped package that went behind the scenes of her and Savchenko's rehearsals.
"We’re halfway through the competition and I've lost 37 pounds," Pieterse marveled. "It really is magical."
On Monday, their beautiful, romantic rumba, set to The Little Mermaid's iconic song "Kiss the Girl", saw Pieterse in the role of the beloved aquatic Disney princess while Savchenko stepped into the shoes of Prince Eric.
Judge Carrie Ann Inaba had nothing but love for the dance, and praised Pieterse for her performance.
"It's so nice to see you this way," Inaba said, referring to Pieterse's confidence and bold dancing charisma. "I love the way your body interprets these dances… I'm just mesmerized."
Speaking with co-host Tom Bergeron after getting the positive feedback, Pieterse reflected on how much she's enjoyed being a part of the show.
"Disney Night is so much fun, and it's about imagination and creativity and following your dreams, and this is something that I never dreamt of, and I'm doing it and I love it," she shared. "I'm so thankful for this opportunity. It's amazing."