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“Baby Got Back” was 1992. The original “Buns of Steel” was around the same time. Even J. Lo's butt is old news.

 But someone is craving a big, round bottom these days.

Buttock lifts increased 283 percent from 2000 to 2005, according to the American Society of Plastic Surgeons. There were 542 buttock implant procedures in 2005, the first year the ASPS started keeping track. There are no stats on the more popular fat transplantation procedures, but plastic surgeons report doing between two and three a week. The procedure was included in ABC's “Extreme Makeover,” making it even more popular.

Several plastic surgeons say that while the '80s and '90s were about making breasts bigger and perkier, in the 2000s, it's all about the derriere.

“Deep down, women have always wanted this,” said Dr. George Lefkovits, a New York plastic surgeon who pioneered a fat transplantation procedure called the Brazilian Butt Fill five years ago. (Men get the procedure, too, but in much smaller numbers.) Lefkovits does at least three a week. “They want to have a more prominent butt. They just never thought it was possible.”

I want a new butt: Of course, there are still lots of women who worry their butts are too big. But there seems to be a growing consensus that real women have curves.

A flat behind is unattractive, says Kimberly King, 35, of Chicago, who had a Brazilian Butt Fill a year ago. She drew the line at wearing a Pad-A-Panty, a garment that gives the rear end a boost, opting instead to avoid certain fashions.

 “A lot of jeans I could not wear,” she said. “Straight skirts didn't look good on me because it emphasized how flat my butt was. I tried doing all the squats in the world, all the lunges, but the more I did, the flatter it got.”

Fashion is one of the big drivers of this desire to have a bigger butt, said Dr. Anthony Griffin, who pioneered the Brazilian Butt Lift (similar to the Brazilian Butt Fill) a decade ago and is the plastic surgeon for “Extreme Makeover.”

“Denim is in, so having a great pair of fitting jeans is very important,” he said. “Designers are now designing dresses with an emphasis on the buttocks and curves. It's just following that trend.”

Kick in the pants:  Fat transplantation has made the road to a bigger bottom much easier.

Griffin performs liposuction on one area (usually the waist, hip or stomach) then transfers the fat to the butt. The procedure is outpatient and takes about four hours. There's minimal pain and scarring and recovery is only a few days.

The procedure ranges from $18,000 to $25,000. But that includes liposuction, filling and reshaping the buttocks.

Megan Scott | ASAP