Mariah Carey 45-lb weight loss tips & tricks: curvy singer wowed fans during the 89th Annual Macy's Thanksgiving Parade in NYC

Mariah Carey wowed the crowd with her amazing body transformation when she performed during the 89th Annual Macy's Thanksgiving Parade in New York City last week. Her 45-lb weight loss secret revealed?

Mariah Carey looked fabulous and fit during the weekend in a tight red dress. While it is not known how much weight the "Touch My Body" singer lost, Radar Online claims that Mariah Carey lost around 45 pounds in the last two months after moving in with billionaire boyfriend, James Packer.

"The new photos of Mariah Carey on Thanksgiving suggest that she has lost at least 45 pounds," Charlene Ciardiello, a celebrity trainer and nutritionist told the website. "She looks incredible."

Ciardiello adds that Carey lost weight due to "dieting and coolsculpting" which are both noninvasive procedures.

"Coolsculpting is a very popular procedure to non-invasively reduce pockets of fat," Dr. Tony Youn, celebrity plastic surgeon who was not treated the singer, told Radar. . "It actually freezes the fat, causing an average reduction of 25 percent of the thickness of fat after one one-hour session. This procedure is scientifically proven to work, and is used for all parts of the body, including the tummy, love handles, thighs, and double chin."

As for her diet, the tabloid reports that Carey eats food carefully prepared by Packer's chef.

Fitness coach Nadia Murdock shared to In Touch Weekly that the singer actually lost around 20 pounds of weight instead of 35 pounds as previously believed.

"In the before pictures, it appears that Mariah may be anywhere between 160-165 pounds. With a voluptuous figure, it's easy to look bigger than you are. In the after photos, Carey appears to have lost between 15-20 pounds," Murdock said.

Murdock, who has not worked with Carey, theorizes that the singer is on traditional weight loss means.

"This is probably due to good old fashion diet and exercise. Also reducing stress can help tremendously with getting rid of abdominal weight usually brought on by Cortisol and emotional eating," she told the magazine.

Earlier this month, Carey moved into Packer's home in Beverly Hills just after dating for five months. According to Sydney Morning Herald, the two have been friends for many years and they first met in Colorado a few years ago at the "Hercules" premiere. Carey is divorced from Nick Cannon in 2014 while Packer split from ex-wife Erica in 2013.