The TOWIE cast were shooting scenes inside an old house in Essex on Wednesday night (29 October) when a fire alarm began to sound, alerting them to get out.
Danielle, her boyfriend James Lock, Jessica and cousin Elliott were among those who were then spotted shivering in their costumes outside while emergency services raced to the scene.
However, after three fire crews assessed the building, it was discovered - according to reports - that someone had trigged the alarm by secretly smoking in the toilets. Tut tut.
The TOWIE gang's party was Mythical Creatures-themed and it's fair to say they pulled out all the stops with their elaborate costumes.
Essex Lothario Mario Falcone was barely recognisable, after covering himself in white and black face paint and adding freaky contact lenses.
Meanwhile, Jessica - who split with boyfriend Ricky Rayment in Wednesday's show - wore a sexy black catsuit paired with feathered wings.
Cousin Elliott wore green body paint for the bash, in the style of the Incredible Hulk, while Lydia Bright rocked some very frightening make-up and a wig.
Lydia's on/off boyfriend James 'Arg' Argent wasn't at the Halloween party, however, as he has been suspended from TOWIE.
Earlier this week, a TOWIE rep confirmed to Reveal that Arg has been banned from appearing in the reality show for a week. This comes following reports that bosses had grown tired of his boozing and timekeeping.
After news of his suspension broke, Arg took to Twitter and apologised for his absence.