Lydia quit TOWIE last year to pursue her fashion career, however the door has been left open for her come back whenever she wants.
In sneak peek pictures of tonight's finale episode, a brunette girl can be seen arriving at Jessica Wright and Ricky Rayment's Prince and Princesses party with her face hidden behind a feather fan.
Yesterday, it was reported that Lydia is returning to TOWIE to confront her ex-boyfriend James 'Arg' Argent over recent cheating allegations.
In his new book, Tales, Tantrums and TOWIE: Living It Arg, Arg writes about how he shared a passionate kiss with Amy Childs in a unisex toilet while he was in a relationship with Lydia back in 2010.
Although they are no longer together, it appears this revelation has angered Lydia enough to make her return to the show that made her famous!
Meanwhile, Arg finds himself in another spin after Lewis Bloor decides to show his mum the naked selfie of her son. Eek, it's not his night!
Tonight will also see Sam Faiers bow out of the show and James Lock attempt to win back Danielle Armstrong.
The Only Way Is Essex, 10pm, ITV2, Wednesday 2 April 2014