Thank you for the question. Even if you were able to find out exactly what breast implant size/profile another person has, it would not necessarily be helpful to you. In other words, a specific breast implant size/profile will not necessarily result in the same look as another person has achieved. Many variables involved in achieving a final outcome; for example, the patient's native breast tissue, chest wall shape, quality of the breast augmentation procedure performed... all are important factors involved. I hope this helps.
Neither Kate Hudson nor Cameron Diaz have confirmed that they have breast implants. The surgeon (if they had surgery) is not allowed to divulge this private information.