'There is nothing like size zero,' Karisma told reporters here Thursday and added: 'We even share our clothes.'
The star of films like 'Zubeida' claims her sister is just trying to stay fit saying: 'Both of us love to eat, we are complete foodies and no she isn't a size zero. Kareena worked really hard just to be fit.'
This year Kareena bagged all the popular awards for her performance in 'Jab We Met'.
Commenting upon her sister's achievements, Karisma said: 'I am a very proud sister. I guess the good values in her have really paid off.'
Although Karisma has not been a regular on the big screen post-marriage, she made a special appearance in Farah Khan's film 'Om Shanti Om'. She was seen shaking a leg with superstar Shah Rukh Khan in a dance sequence in the song 'Deewangi deewangi' last year.
'Yes, I have been laid back on this front to be with my family,' she said.
On being asked whether she would be seen in a project with Kareena soon, Karisma maintained that they have been offered many scripts to work together, but whenever it would happen, they would announce it on a big scale.