BEFORE & AFTER Christina Aguilera sparks butt implant speculation with new pictures

Within the past few years, Christina Aguilera went through a massive slim-down, then had a baby and now is back in great shape — although some are now speculating that her new shape didn’t come entirely naturally.

“Christina’s definitely got back! Her buttocks are almost impossibly round and full for her tiny size,” plastic surgeon Dr. Anthony Youn told PopDust. “I suspect that she may have had buttock enhancement via a Brazilian Butt Lift, where fat is injected into the behind to enhance it. Overall though, she looks great.”

There does seem to be a significant change in the shape of her booty in recent years — and even in recent months, if you compare the photo at right, which was taken in February, with the one at top, which was taken last week.

Before and after: Christina Aguilera in 2012 and 2015.

Based on her past comments, Christina is likely happy with her new figure. (In case we couldn’t tell by the way she is working it in the new pictures!)

“Actually, the challenge I’ve always had is being too thin, so I love that now I have a booty, and obviously I love showing my cleavage,” she told Lucky in 2012. “Hey, if you can work it and you can own it, that confidence is going to shine through.”