Sam later admitted the Essex girls had “drifted apart” yet they patched things up for the sake of bride to be Billie, 28, with baby Sunday’s parent making a cameo in the next episode.
A teaser clip aired on Wednesday’s programme showed Billie’s friends gathered together, posing for a picture.
Dressed in matching outfits and holding glasses of fizz, they all cut a similar appearance, yet eagle-eyed fans spotted Ferne on the right of shot.
The blonde was beaming as she joined in the celebrations ahead of Billie’s marriage to Greg Shepherd, much of which she confirmed would air on her show.
A later scene showed Billie and elder sister, Sam, taking their celebrations to the bathroom, where they chanted: “Mums on the loose, mums on the loose.”
Meanwhile, it appears Sam may face much disruption on the hen do, as she is forced to leave partner Paul Knightley with an extensive briefing about looking after their daughter, Rosie, who is almost one.
Meanwhile, speaking exclusively to OK! online about up plans to air her wedding on the ITVBe reality TV series, the mum of two confirmed Ferne was also invited to be present in the lavish Maldives ceremony.
Yet while fans will get a snippet of the stunning ceremony on-screen, she told us certain aspects would be kept private.
Billie was first to tell OK! online: “Ferne is coming – yes of course. Ferne was a friend before TOWIE, we have known each other since we were 10 and we’ve been friends for 17 years.”
Yet aside from the telly favourite, the rest of the congregation will be a TOWIE-free affair.