The couple are reported to have had a secret seven hour rendez-vous at the 'X Factor' judge's London hotel on Monday night, where the Formula One driver was caught sneaking out at 3am.
And he probably would have managed to go undetected if his car hadn't have broken down. Can't a Formula One driver get a pit stop when he needs one, eh?
A friend of the couple told The Sun: "They were determined to keep the meeting under wraps, which is why they chose a hotel that isn’t used much by celebrities.
"Nicole will be livid Lewis’ car broke down because that’s what meant their cover was blown. He had to get out to let the mechanics sort out the issue.
"There’s something that keeps pulling them back together. Lewis even took his dog Roscoe so Nicole could see it."
The couple had been together on-and-off for five years before they split again in July.
Lewis hinted that he was hoping for a reunion in an emotional outpouring on Twitter, soon after their break-up.
"If you’ve found that special some-one, don’t EVER let them go no matter what!!" he tweeted. "Nothing in this world is more important."
He earlier revealed that his split from Nicole had 'turned his world upside down' in a subdued interview with Sky Sports.
However, Nicole seemed to pour cold water on his hopes of a reunion when she told The Sun in August: "The truth is we're no longer together. It is over.
"I know he's been very public about trying to get me back, but we're still not together."
Not only could Nicole not find the right camera to look down when Dermot caught her off guard to introduce her next act one week, she then proceeded to introduce James Arthur's name instead of Rylan Clark's. Whoops! Bonkers-o-metre rating: 5/5
Nope, us neither. She lost us at full fat milk. Bonkers-o-metre rating: 5/5
There was only ever going to be one judge who actually got up on the desk following Rylan's Spice Girls medley in week six, and it sure as heck wasn't going to be Borelow. After dismounting the table, she exclaimed: "That was a Rylan spice explosion all up in this place because you didn't just spread love, you sprayed it all over that stage honey. Girl power." Bonkers-o-metre rating: 4/5
Nicole just loves to talk about balls, especially Jahmene's which she did live on air during the first live show. When Dermot questioned her, she cheekily replied, "it takes a lot of guts and balls to survive in this business and you obviously have big balls yourself, right?" Cheeky. Bonkers-o-metre rating: 3/5
And Nicole committed her love of balls to song - a duet with James Arthur entitled 'Vaginas And Big Hairy Balls'. You certainly wouldn't have got Cheryl or Dannii doing that. Bonkers-o-metre rating: 5/5
We now snap our fingers twice at every word we say. It can get surprisingly annoying after a while, so we've been told.... Bonkers-o-metre rating: 5/5
Nicole got a little carried away after Rylan's performance of Mousse T's 'Horny', and decided to sing her own version to GB. Bonkers-o-metre rating: 4/5
Nicole proved she can always be relied upon to put the effort in at a fancy dress party when she revisited her Pussycat Dolls past in Rylan' birthday bash dressed in a PVC basque and fishnets. Bonkers-o-metre rating: 3/5
Nicole Scherzinger - 'X Factor' judge by night, Asda worker by day *taps back pocket*. She was transformed into an shop worker in tribute to her contestant Jahmene Douglas, who used to work for the grocery giant before entering 'The X Factor'. At least she's got something to fall back on if Simon Cowell ever axes her again. Bonkers-o-metre rating: 3/5
Never let Nicole make you a dessert is the lesson we learnt from this. Bonkers-o-metre rating: 3/5
We all let out a little *tee hee* when Nicole didn't realise that spunky meant something entirely different over this side of the Atlantic as she described Lucy Spraggan's first live show performance as 'spunky, honest and witty'. Bonkers-o-metre rating: 3/5
We were totes surprised that Nicole didn't opt for a vajazzle when she visited Amy Childs' salon with Rylan Clark. Bonkers-o-metre rating: 1/5
*snaps fingers twice*, OBVZ Bonkers-o-metre rating: 3/5
Always calm in a crisis, Nicole's response to a wannabe kicking off big stylee at this year's auditions was "no, baby, no! Inappropriate!". Bonkers-o-metre rating: 2/5
Nicole was public enemy number one when she brought Rylan Clark through to the live shows. But if she hadn't we wouldn't have had this piece of TV gold in our lives. So thank you, Nic. Bonkers-o-metre rating: 1/5 - Rylan totally eclipsed her.
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