Tensions on The Block have reached an all-time high after Brisbane frontrunners Jimmy and Tam have been left ostracised by the rest of the Blockheads following rumours of favouritism swirling around the building site.
Despite the teams pretending to be the best of friends while the cameras are rolling, an on-set spy tells Woman's Day the Queensland couple found it hard to mix with the contestants after winning a series of controversial room reveals.
"They're definitely being excluded from the group," the source tells.
"The couples are trying to play happy families while filming, but it's like walking on egg shells with Jimmy and Tam behind the scenes."
The insider adds that the green-eyed monster has got the better of many of the couples who believe Jimmy, 33, and 31-year-old Tam's 1950s house is a lot easier to renovate and style than their own.
They also feel the judges –Shaynna Blaze, 57, Neale Whitaker, 58, and Darren Palmer, 42 – are favouring the pair.
"There's really a bit of pent-up animosity towards them – they feel Jimmy and Tam have been given an easier hand with their build," says the source.
"They just don't think they should have won so many room reveals."
The revelation comes after the usually happy Jimmy and Tam were snapped on set looking pained and stressed.
At one point, plumber Jimmy appeared to wipe tears from his eyes while talking to a producer, while Tam made several frantic phone calls.
Talking to Woman's Day, the fan favourites were determined to put on brave faces, claiming their fiercely competitive streak "makes the show more interesting".
"It's always good to have competition, I think it's healthy," says Tam.