10/07/2013 09:44 EDT

Christina Aguilera Surgery Speculation: Did 'The Voice' Singer Have Liposuction?

Christina Aguilera may have had liposuction to slim down.

"The Voice" US judge is looking better than ever, and has been promoting the singing show in tiny dresses that show off her physique.

She recently revealed that she'd rather spend time with her five-year-old son Max than in the gym, and a Beverly Hills surgeon thinks she may have had a little extra help.

"In ten months, patients may lose up to as much as 80 lbs or more with aggressive diet, exercise, diet pills, and/or bariatric surgery," Dr. Lance Wyatt, who hasn't treated the singer, told RadarOnline.

"Looks like Christina may have had liposuction of her body and/or tummy tuck for flatter abdomen and more narrow waistline."

Nutritionist Dr. Pescatore also told the website Christina could have had a breast lift, as her chest seems to have shrunk a little since her weight loss.

However, those close to the star insist she has simply made changes to her diet.

"Once she became serious about losing the weight, she stopped eating out. They've barely gone out at all in the past three months," an insider told Life & Style magazine.

The Voice producer Mark Burnett also said: "Christina is in such good shape; she looks like a professional athlete. She's as happy as can be, as fit as can be and as full of life as can be. She looks amazing."

Also on HuffPost

Photo gallery Slimmed-Down Celebrities: Stars Who've Kept The Weight Off See Gallery