Hello and Great Question. I appreciate the time you are spending researching this procedure. My name is Dr. Matthew J. Nykiel. I am a Board Certified Plastic Surgeon, a Fellowship Trained Cosmetic Surgeon, and a Butt Augmentation Specialist. I don't know the specifics of Beyonce's Hips or Kim Kardashian's Booty. Typically, a contrast in size between the butt & hip to waist as significant as KK is achieved by: 1) Multiple Rounds of Fat Transfer 2) Combination of Fat Transfer to the Butt & Butt Implant 3) Large Butt Implant 4) Fillers to the Butt as a stand alone and/or in combination with any of the above butt procedure. Beyonce's hips can be created via fat transfer and/or fillers to the hips. I do NOT recommend hip implants. Let’s Discuss each of these options: BRAZILIAN BUTT LIFT: A Brazilian Butt Lift or BBL can be thought of as a combination of two procedures: 1) Liposuction and 2) Fat Grafting. In an artistic way, BBL can be thought of as sculpting the torso and buttocks to refine and define the hour glass with a “bubbly butt”.Liposuction:The first portion of the procedure involves liposuction 360 degrees around your torso. The focus is to sculpt your body in 3D to create an hour glass. This is first done by liposuction of your flanks to create the silhouette of the hour glass. Then the liposuction proceeds to your tummy, back, and waist to flatten the tummy and create that “S” Curve of the back when viewed from the side. In addition, this gives a "rough" sculpting of the “bubble” or the “shelf” in the transition from the back to butt. Next, I sculpt and mold the gluteal fold. Fat Processing:After the liposuction, the fat is then prepared to contour and augment the hips and buttocks. In my practice, I take fat preparation very seriously. Studies have been performed showing that the liposuction removed contains 30-70% fluid (NOT Fat!) injecting a high concentration of this "non-fat" particles will cause your butt to be swollen initially; but will decrease with time! . In fact, I believe this is the reason why some people complain that their Brazilian Butt Lift did not last (after the swelling went down). Why am I discussing this? Because, this is not something that can be "sped-up" and definitely not something you want "short-cutted"; in my opinion this is THE most important portion of the fat transfer and is a major contributor to the fat "take". In my practice, I utilize a proprietary technique to separate, isolate, wash, and clean the fat. Fat Transferred:Once the fat is prepared, I begin by contouring your hips and overall buttock frame. Again, this contouring is done as 3D sculpting. So, if viewed from the back, side or angles the butt will have full “bubbly” appearance. After contouring the buttocks, I then utilize the fat to increase the volume and projection. The goal is not to simply increase the volume of the butt; the goal is to create/sculpt a buttocks with the correct projection. In other words, trying to get the butt to “pop”. The balance of liposuction, fat grafting, and 3D sculpting is what makes the Brazilian Butt Lift or BBL such a powerful procedure! However, the main limiting factors are: 1) How much fat is available for liposuction and 2) How much the skin will stretch to hold the fat. Therefore, when individuals are wanting a LARGE butt, multiple rounds of fat transfer are performed. The butt is "filled" until the skin no longer stretches and then 6 weeks to 3 months later after the skin has relaxed the procedure can be performed again. A Brazilian Butt Lift is fat transferred to the butt. Therefore, the fat will grow and shrink based on weight gain or loss. Even with weight loss, more fat is concentrated in your butt then previously so your butt will be permanently larger than it was before. BUTT IMPLANT:Butt Implants are available in multiple shapes and sizes. The specific type/shape/size that is chosen is based on your buttock/frame/shape goals. Butt implants are great at providing projection to the butt. In fact, the implants are so good at this that 1cc of butt implant = 3-4cc of fat transferred. Butt implants are not the best at widening the hips or sculpting the frame. Therefore, I typically will perform combination butt implants AND liposuction with fat transfer in certain individuals wanting a large butt and needing the hour glass refined/sculpted. Weight loss and weight gain do not affect a butt implant. Unlike breast implants, butt implants are permanent implants. BUTT FILLERS:Butt Fillers are a great option if: 1) You do not want surgery and want a "Non"-Surgical Option 2) You want more volume to your butt/hips but do not have the fat. I perform this type of procedure frequently; and there is a significant amount clientele (i.e. actors/actresses; professional personalities; socialites) that can not have the downtime from surgery; however, need an increase to their hip/butt. Weight loss and weight gain do not affect fillers. Depending on the type of filler you can have a permanent effect all the way down to the filler only lasting 6 months. It is completely up to you.Best of Luck! Please reach out if you have any further questions or concerns. Matthew J. Nykiel, MD#TopREALSELFDoctor#CoreREALSELFDoctorButt Augmentation SpecialistLiposuction SpecialistBoard Certified Plastic Surgeo