Ellie entered the Big Brother house in yesterday's live launch, one of 16 housemates currently in the house.
However Hayley AND Ellie were both due to enter the show together as a pair, like the four other duos currently on this year's cast.
But Ellie in the end took part solo and allegedly left Hayley in Magaluf without telling her.
A source spilled to The Sun newspaper: "She is raging. Ellie didn’t tell her she was flying back to Britain to go into hiding without her."
They explained: "She said she was going home to do promotional appearances.
"Hayley only found out this weekend and she is furious that she got left behind.
"They are sure to have a big fight when they eventually meet up again."
The tabloid suggests that they could end up coming face to face in the house, with Hayley currently on stand by to enter if show bosses decide to put her in the mix.
Meanwhile, Ellie finds herself chalked up as the early favourite to win this year's series.
But on just Day 2, we've got a HUGE way to go yet...
Big Brother 2017 continues nightly on Channel 5.