"There were lots of rumours about Louis and Lucy when he was judging Tumble and she was a contestant," a source told the Sun. "It's true they were flirting but nothing happened."
Lucy Mecklenburgh and Louis Smith have reportedly started dating
Louis, 25, started dating someone straight after Tumble, but when they split and he bumped into Lucy, 23 again, sparks flew.
"They had a brilliant time and things are really heating up between them," the source added. "The way things are looking, they could be together for a long time."
Just last month, Louis – set to appear on reality show The Jump in the New Year – shared a black and white photo of himself with Lucy. "Look who I found… @lucymeck1. She looks just as good in a dress as she does in a leotard #tumble," he wrote in the accompanying caption.
Lucy Mecklenburgh recently enjoyed a short-lived romance with Gethin Jones
Lucy's new romance with Louis comes after her short-lived relationship with Welsh TV presenter Gethin Jones.
Lucy and Gethin – previously engaged to Katherine Jenkins – were first linked back in August, and were pictured holding hands on a date the following month.
Despite their split, the pair have remained friends. "We're not dating," Lucy recently confirmed to New magazine. "We went out a few times a while ago but it was bad timing for both of us. I was so busy after Tumble and he travels a lot, so it wasn't the best time."
Insisting that she and Gethin were never "official", the former TOWIE star added, "(We're in touch) as friends. He's the nicest guy. It was a mutual thing."