BBL for skinny petite Asian girl: Can I get a BBL without gaining weight? (Photos)

Thank you for your question and posting appropriate pictures. You sum to be a good candidate for BBL. I do not believe in gaining wait before BBL unless you are going to keep the wait in after. I like to maximize fat take in skinny BBL patients by using WAL body jet. This increases fat take from 60-80%. You would need a consult for precise recommendations either in person or via Skype/FaceTime. 

A good candidate has enough fat available for transfer in the procedure. The amount of fat that can be transferred in a BBL depends on how much fat the patient has to harvest and the amount of space there is to move the fat into. It is recommended for the patient to have a BMI of 30 or less. If you are too thin, a Brazilian Butt Lift may not be possible.

Patients interested in BBL often ask questions of the necessary volume for transfer. Ultimately, the answer is two pronged and based upon both patient expectations and the nature of fat graft themselves.
BBL and fat transfer is ultimately dependent upon the long term viability of the fat grafted. That being said the resorption rates of fat transferred can be significant. Clinically this translates to a progressive loss of grafted volume in the months following the procedure.
I tell patients that they can expect resorption or graft loss on the order of 50% (at most; prepare for the worst and hope for significantly better). Additionally some harvest volume is lost in processing the fat graft prior to transfer. Thus I generally recommend that patients seeking even the most minimal volume increase have adequate reserves for grafting of 500 cc per cheek (at minimum).  This means that harvest will usually exceed 1 liter (assuming for processing loss).
However, it important to remember that these are recommendations and can be amended based upon a patient's particular expectations. Some patients only want a subtle change and may be willing to accept a less significant result. But the rule still applies you have to have the fat to transfer the fat.
With regards to your specific question, you appear to have moderate reserves available for transfer. The best candidates are healthy and have reached a healthy stable weight (preferably with a BMI < 30). I don't typically encourage weight gain (unless you plan to maintain that weight post op) as the transferred volume can be lost.
Ultimately, "enough" is relative to expectations. Those seeking dramatic changes need to have the available donor fat. However, your donor fat do not determine your candidacy for surgery. Your candidacy is defined by your expectations. As long as your goals are in line with what can be realistically achieved, then you can proceed.
As always, discuss your concerns with a board certified plastic surgeon (ABPS).

Thank you for your question.The results of the BBL are completely dependent on how much fat can be removed and injected back in. It does not appear that you have much fat to be removed. The surgeon may suggest you gaining some weight before the procedure.

Hello dear!
Thanks for the pictures and provided information as well.
Based on your photos, you are a great candidate for liposuction with moderate BBL, and I think you'll get very good results. 
Liposuction allows your plastic surgeon to transform your entire shape. You improve your abdomen, waist, back, flanks and of course your buttock to give you a beautiful heart shape.
l recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Good luck :)

You have very little excess fat for a BBL. If you gained weight before surgery, as was recommended to you, the fat would accumulate in areas that can then be suctioned out during your BBL. The advantage of this is the fat from those areas would be transferred to your butt and hips and if you did gain weight after surgery instead of accumulating all the fat in those same areas your buttocks tends to get bigger. A number of patients would find this as a positive ie they gain weight and most of the fat is deposited into their buttocks. Please note that some patients may find this as a negative. At the recent aesthetics society meeting that was held in New York this year, the society strongly recommended that if you are going to perform a BBL, you should inject fat only in the fatty tissue above the muscle. Many surgeons inject fat into the muscle and the society feels that it is much safer to inject fat above the muscle. Over a year ago I started using a new high tech device, called the Vibrastat. It allows for performing BBLs in the soft tissue layer above the muscle. I hope you find this information useful. Please watch the enclosed video.