The Pussycat Doll singer and former X Factor USA judge will be the latest star to fill the fourth spot on the panel, following stints from Geri Halliwell, Leona Lewis and Rita Ora.
"I'm super excited to be back in London for The X Factor!" said Scherzinger, who was a guest judge during the auditions and Boot Camp stage of the 2010 series.
"Last time I was here we found One Direction and I can't wait to find more unique and interesting talent here in the UK."
Following the departure of Kelly Rowland, a full-time fourth judge has yet to be found. Geri Halliwell and Rita Ora are reportedly in the running to get the gig full-time. However, the Spice Girl apparently failed to gel with Louis Walsh, Tulisa Contostavlos and Gary Barlow during her guest stint in Liverpool.
Ora has been impressive during her stint on the panel in London, but her lack of experience may count against her getting the job permanently.
The X Factor auditions continue today at London's O2 with Ora appearing in the morning session and Leona Lewis in the afternoon. Scherzinger will appear tomorrow at the O2.