Does anyone know which doctor famous celebrities go to for butt implants?

Ethical plastic surgeons will always respect their patients' right to privacy.  If not, this is a red flag, which shows that they might be willing to break other protocols--including patient safety--just to protect their own interest.  Always remember that a good surgeon will always prioritize patient safety above anything else, and will have no qualm turning down someone who is a bad candidate due to unrealistic expectations, medical condition, etc.As regards to your goal--i.e., achieving bigger buttocks--there are two main options.  Buttock implants and Brazilian butt lift in which your own fat is used to reshape your derriere.  Contrary to popular belief, butt augmentation is not just about augmentation, but more importantly, creating natural body proportions. Buttock implants that are too big for your anatomy can increase the risk of rippling, visibility, shifting, protrusion, and infection.  To avoid them, we must work within the boundaries of your anatomy. The result of Brazilian butt lift, meanwhile, will depend on the amount of your excess fat.  This procedure involves liposuction to collect fats from the donor sites such as the tummy, hips, flanks, and thighs, which are then purified prior to re-injection. When choosing a plastic surgeon make sure that he is board-certified (American Board of Plastic Surgery) who performs body contouring surgeries and butt enhancement procedures.  Of course, you must be confident in his skills.I hope that helps and good luck. 

Board certified plastic surgeons will never disclose any of their patients information.  If you want a "celebrity" plastic surgeon search surgeons in major cities such as NYC, Miami and LA.  Be sure to pick a surgeon based on skill set and experience and NOT on his/her "celebrity status".  Be sure to choose a board certified plastic surgeon with significant experience in buttock augmentation.  Ask to see pictures and speak with patients.