First of all, eating high calorie foods isn't at all healthy.  My friend is doing exercises for her butt and it has really been helpful for her.  She doesn't have to go to gym per se, because she does this exercise all the time.  This is an exercise for toning butt muscles.  For example, squeeze in your butt (not with hands) you do this without hands, just using your butt muscles, keeping them squeezed for about a minute or so.  You don't have to time yourself.  All you have to do is do this several times a day....like when you're watching TV or standing in line, etc..You can practically do this anytime.    When walking, you can also squeeze in your tummy by using your tummy muscles.  You do this just like you do it with your butt.  It allows for the muscles to tone themselves and at the same time burn whatever extra fat you have.   As far as the diet, it should be 60% vegetables, fruits.  The rest, just do a little of everything.  Don't try to cut yourself off of foods you like, just eat the fatty stuff as little as you can.    And at last, keep your attitude positive!  You can do it!