THE Bachelor villain Jennifer Hawke says she gained 10 kilograms in the mansion and even after filming wrapped up months ago, she still hasn't been able to shake off the extra weight.

The 27-year-old marketing manager revealed she ate a whopping 2.5 kilograms of Nutella in 10 days while on set of the reality TV love-match show.

"I put on 10 kilograms in the mansion, and I have only lost three since filming wrapped," she told New Weekly.

"I went in there with a plan to sabotage the girls by baking all the time and making them gain weight. I made them brownies, scones, cheesecake, mousse and muffins.

"Anyway in the pantry was a three kilogram jar of Nutella and it was a joke that the Nutella would last us three months in the house.

"I was like, 'That will last me two weeks,' and they were like, 'Ha-ha, funny Jennifer'. Challenge accepted.

"I ate through 2.5kg by myself and the other girls had 500 grams - and I did it in about 10 days.

"I stress eat too so I'd get into the Nutella before a rose ceremony."

Hawke also slammed sweetheart contestant Cobie Frost, 30, calling her a "hustler".

"(I told the girls), 'She's playing you hard, she's a massive threat.' She played those girls. It was outwit, outplay," she told the publication.

The Bachelor airs on Wednesdays and Thursdays at 7.30pm on Channel 10.