The reality TV star, 27, is said to have entered The Priory to curb his partying ways after getting suspended from ITVBe series, The Only Way Is Essex.
Earlier this year, it was confirmed that he'd been asked to take some time out from the show after reportedly testing positive for cocaine.
The Sun now claims the star has checked into The Priory in a bid to tackle his problems - and hopefully win back on/off girlfriend Lydia Bright.
A TOWIE spokesperson has revealed that Arg will NOT be on the show again for the foreseeable future, saying: "He is currently suspended from the show and won't be in the Christmas special."
A source told The Sun newspaper: "James was devastated by his suspension from the show and is truly sorry for letting down the cast and production team on the last series.
"He's made the brave decision to spend his birthday and the festive period in rehab."
Arg did not feature in the series finale, following his suspension from the reality show amid claims that bosses were fed up of his partying.
He also made headlines in August after sparking a police manhunt when he failed to turn up for a scheduled flight. It later emerged that he had in fact checked into a hotel and fallen asleep.
Then, in October during a flight to Ibiza with his TOWIE co-stars, Arg was caught on camera having vomited down his shirt due to drinking too much alcohol.
He was last seen on screen trying to persuade Lydia to give him another chance...
We hope Arg is back to his best soon.
Would you like to see James 'Arg' Argent back on TOWIE soon? Tell us in the comment box below and you could win £50!
Check out TOWIE's rudest ever moments:
Copyright: Rex Features Tom HortonReveal is now on Google Plus! Join us here for the latest pictures, fashion and celebrity news!