Viewers will see the Albert Square wild child - played by Jacqueline Jossa - spiral out of control as Tanya prepares to marry Max.
According to the Daily Star Sunday, Lauren leaves a trail of destruction in her wake in the buildup to her mum's big day, cutting up Tanya's wedding dress, smashing the cake and ruining her dad's suit.
In the aftermath, her parents are said to be so upset that they even discuss cancelling their Christmas nuptials.
"Her parents have been planning their special day for months and finally, when everything is done, Lauren loses it," revealed a show insider.
"She goes crazy, smashing up the house and all the wedding stuff. Her parents are disgusted with her and, with no dress, Tanya is adamant the wedding is off.
"She sees it as a sign not to get married. Whether or not they go through with it remains to be seen."
In the run-up to Christmas, Lauren's behaviour is due to become more and more erratic. After entering into a passionate affair with her cousin Joey (David Witts) and making a narrow escape from a dramatic car crash, viewers will see her turn to drink as she tries to come to terms with her feelings.
"Lauren has always been wild but by the time the wedding approaches she has gone completely off the rails - again," the source explained.
"One thing's for sure, she is not going to be forgiven this time. And if [Max and Tanya] do manage to salvage their special day there's no way Lauren will be welcome."