Leg/arse or Larse

Hi can anyone help. I am in reasonable shape and do not have a very big bottom but my boyfriend has given me a complex saying that he cant tell where my leg stops and my arse begins. Do you know any exercises that will help me achieve a defined line between my leg and bottom.

[5kgLifter]

Squats, lunges, any exercise that involves stepping up etc, and cycling will do it too.