The pair delighted fans with their "chemistry" on Saturday night, and proved their close friendship once again when they were seen cuddling outside their London dance studio.
The boy band star shared a taxi home with the Ukrainian professional as they wrapped another day of training for their Jive this weekend.
Parting ways for the evening, Lee was seen drawing Nadiya in for a tight hug before bidding her farewell with a kiss on the cheek.
The pair have been seen getting cosy before, and Lee is said to be "besotted" with her – but both have laughed off claims of a romance and are happily in a relationship.
The Blue singer insists his on-off girlfriend Samantha Miller is the woman for him, while Nadiya is in a relationship with Slovenian footballer boyfriend Matija Skarabot.
However that did not stop fans from noting their chemistry on Saturday night when they hit the Strictly floor for the first time.
The pair made their show debut with a stunning Waltz, which even Darcey Bussell dubbed "lustful".
Shirley Ballas then said the pair had "amazing chemistry", sending viewers into meltdown on Twitter.
One wrote: "They’re talking about the chemistry between Lee and Nadiya – surprise surprise #Strictly”.
And: “Lee that was bloody gorgeous #Strictly wow beautiful couple”.
But other fans were less convinced, chiming in: "Prediction. I think Lee offa Blue and Nadia will be giving us a showmance. Keep an eye out.”
The comments come after show host Tess Daly revealed it's "inevitable" that romance blossoms between celebrities and their dance partners.
Many stars have found love on the series in the past, including Ben Cohen and Kristina Rihanoff, Matt Di Angelo and Flavia Cacace, and Rachel Riley and Pasha Kovalev.
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