The Pussycat Dolls just performed together for the first time in almost 10 years: Watch their epic performance!

The Pussycat Dolls are officially back!

Days after surprising fans by cryptically announcing their comeback, the girl group performed live on the finale of "X Factor: Celebrity" in London on Saturday night, marking their first performance together in nearly a decade.

Led by Nicole Scherzinger, who served as a judge on "X Factor" this season, five of the group's six members delivered a high-octane medley of some of their most memorable hits that topped the charts throughout the mid-2000s: "Don't Cha," "Buttons" and "When I Grow Up" garnered cheers from the crowd as Scherzinger and her group mates launched into electric choreography.

Ashley Roberts, Kimberly Wyatt, Carmit Bachar and Jessica Sutta also joined Scherzinger for the performance. Original member Melody Thornton was noticeably absent.

The performance finished with a "Flashdance"-esque moment, as the Pussycat Dolls leaned back in five chairs as water shot at them from the ceiling. The group then performed the beginning of their soon-to-be-released comeback single, "React."

"It was so great to be back together again. The energy from the crowd was amazing and spurred us on," Scherzinger, 41, said after the performance, per Page Six. "This is just the beginning of what we have in store for everyone!"

Earlier in the week, PCD announced a mini, nine-date tour of the U.K. set for April 2020.

The Pussycat Dolls were originally founded by Robin Antin as a burlesque troupe that she eventually turned into a pop group at the suggestion of legendary record exec Jiimmy Iovine. The group released two studio albums, "PCD" and "Doll Domination" in 2005 and 2009 respectively, before breaking up in 2010.

Watch the Pussycat Dolls' comeback performance below: