The Scottish former rugby player is competing on the British talent show as a member of boyband Try Star, and judge Nicole is apparently spending time with the sportsman off camera too, as the pair is reportedly "secretly dating".
A source told Britain's The Sun newspaper the "Don't Hold Your Breath" singer, 41, enjoyed a romantic date with the 34-year-old earlier this week (begs November 11), with the pair having had "great chemistry" from the start of the show.
"Thom is completely Nicole's type. And for his part, Thom was smitten early on - he's always said Nicole is one of the most beautiful women in the world," the insider said. "He fancied her long before meeting her on the show. He was initially a bit nervous about starting something up, and ruining his chances on the series, but they had great chemistry from the off."
"And after weeks of texting, Thom finally plucked up the courage to ask her out, and took her for dinner."
The source added that the pair had met up with friends over drinks during a fun night out, and had the "time of their lives", but insisted both Nicole and Thom want to concentrate on the ITV series and wait to see what happens when the show wraps.
Meanwhile, reports have claimed the musician is set to reunite with her former The Pussycat Dolls bandmates, Ashley Roberts, Kimberly Wyatt, Melody Thornton, Jessica Sutta and Carmit Bachar, and plans to announce their comeback on the popular U.K. reality show.