Not a happy ending: the relationship between Magda Szubanski and Jenny Craig has finished for the second time.

Just six months after she was re-signed, Magda Szubanski has split with Jenny Craig.

It looks fishy and some news outlets are reporting that it is because Szubanski failed to lose upwards of 30 kilos fast enough.

A spokeswoman for the weight loss company confirmed the 53-year-old comedian will no longer hold her role as an ambassador, but refused to be drawn in on the reason why.

Szubanski in 2012, during her first stint as ambassador for Jenny Craig.

Szubanski in 2012, during her first stint as ambassador for Jenny Craig.

"Jenny Craig and Magda Szubanski can confirm that their working relationship will not be continuing," she told AAP in a statement on Wednesday.


"Magda will pursue her weight loss journey privately."

It is a surprise move given Szubanski's contract was reportedly worth more than $1 million.

The split comes only half a year after Jenny Craig re-signed Szubanski in March, so the Kath and Kim star could try to shed the kilos she re-gained after her previous weight loss success with the company.

Szubanski famously lost 36 kilos with Jenny Craig, dropping to 85kg from 121kg between 2009 and 2011.

The comic starred in Jenny Craig's ad campaigns and was credited with triggering a spike in new customers.

But her failure to maintain her goal weight reportedly led to her being dropped from the company's promotional material.

She was replaced by rising star Rebel Wilson, who was then succeeded by former Spice Girl and X Factor judge Mel B last year.

Szubanski drew criticism for signing back on, including from radio commentator Matty Johns, who lamented the company was "rewarding people for being fat, and getting fat again".

She blamed "calorie amnesia" and a broken rib for the piling the weight back on.

Szbanski and her management are yet to respond to calls for comment from Fairfax Media.