The 'Don't Hold Your Breath' singer appeared as a temporary panellist on the 2010 series of The X Factor, filling in for then-judge Dannii Minogue while she was on maternity leave.
She was then awarded a permanent position on The X Factor USA after Cheryl Cole was axed, but left the show upon the completion of its first season.
Tweeting ahead of the latest X Factor auditions in London this week, Scherzinger declared: "Super excited to be back in London for @TheXFactor! Can't wait to find more unique and interesting talent.
"Looking forward to seeing my UK fans in London at the 02. I'm so grateful and blessed to have them!!! #secondhome."
After completing her stint with Gary Barlow, Tulisa Contostavlos and Louis Walsh today (May 31), she wrote: "Great day w/ @theXfactor @officialtulisa @gbarlowofficial @walshlife! We saw some amazing talent! Thanks UK for always being so kind to me! #grateful."
Prior to Scherzinger, Geri Halliwell, Leona Lewis and Rita Ora had all completed guest stints on the panel.
A permanent fourth judge is still to be found, with the latest rumours suggesting that Minogue is once again in the running after allegedly rejecting a £1m offer to return.
