Reports ahead of tonight's CBB final have alleged that the two enjoyed a "fling" shortly before Calum entered the house in January.
Calum was evicted from the series earlier this week having polled the fewest votes in the final public poll when lines had frozen.
According to The Sun newspaper, Calum and Big Brother 2014 winner Helen met shortly before Celebrity Big Brother 2017 through mutual friends.
"They had a bit of a fling before Calum went into the CBB house," a source told The Sun newspaper.
They explained: “It was very brief but they met on a night out and exchanged numbers, and stayed in touch. It was quite low key but there was definitely something there. They got on very well.”
A spokesperson for Helen Wood declined to comment on the story.
Calum yesterday was forced to speak out to reassure fans he was okay after missing a number of TV gigs following his eviction.
Calum failed to turn up for his appearance on CBB spin-off show Bit On The Side, forcing an audience member to step in.
According to host Rylan Clark-Neal, no one had any idea where Calum was when he failed to appear for the show.
At the start of the episode, Rylan told cameras: "Finally we were supposed to have Calum Best on, but we genuinely don't know where he is. This ain't even a gag. This really ain't.
"So, I had a little thought and thought who could I put in Calum Best's place tonight? It's got to be someone quite close to him. So, I love her and I think she deserves this so please be upstanding for our very own Barbara."
Calum tweeted last night: "Sincerest apologies to @bbuk #bbbots and @ITVLorraine been crazy I'll since leaving the house . Will make it up."
Celebrity Big Brother concludes tonight at 9PM on Channel 5.