The summer edition of the reality show, which will see cast members travel to the Spanish holiday destination, will air on ITV2 on Wednesday, June 13 at 10pm.
Titled The Only Way Is Marbs, the episode has been promoted as the "sexiest" ever in five series of TOWIE.
"Those who have been chosen to go to Marbella can't wait," a source said of the special. "The girls have pledged it will [have] lots of bikinis and bare flesh on show.
"There will be a lot of boozy partying and cameras will follow them 24/7 for a week."
However, Lauren Goodger is not expected to make an appearance, as she was suspended from TOWIE over a row with producers when the episode was planned.
The beautician has since been invited back onto the show and has featured in later episodes of series five, which concluded last Sunday (May 27).
