Ok so ya most of us arent in the right shape :P lol or even qualified to really advice most of the celebs but ya watever....

. Just from what we have observed lets come up with suggestions for celebs....;
Kareena- i have seen in the latest pics that she has put on lil weight...which i think was much needed but i think what she needs to do is keep toned.
Priyanka- thanx to her face cut she managed quite well with her, newer thinner look. Her only issue is that her shoulders r bit weird lol i dont know if i am the only one who noticed it but she is kinda broad on the shoulder and have a contrasting waste line which looks very weird in some dresses. So ofcourse since she cant or rather wudnt do much abt her tiny waist :P what she should do is minimise wearing clothes that highlight her shoulders...
Katrina- She is lil big down waistline so she needs to stop wearing anything that highlights that part. She looks lovely in sarees and gowns.
Vidya- if you dont like going to gym than just wear shalwar kameezes :P.