Jessica Simpson, Eric Johnson Jessica Simpson and Eric Johnson at the annual White House Correspondents' Association Dinner in Washington, May 3, 2014. Photo: REUTERS

Jessica Simpson may have recently dropped 60 pounds, but her weight loss isn’t the only physical transformation she is rumored to have made ahead of her Fourth of July wedding to Eric Johnson.

In the July 7 edition of Life & Style magazine, plastic surgery experts accuse Simpson, 33, of recently going under the knife before her walk down the aisle. According to the tabloid's report, Simpson has not only utilized Botox, fillers and lip injections in recent months, but one expert claims the “With You" singer also appears to have undergone rhinoplasty. 

“Looking at the shadows along her nose, it is very probable she has undergone a nose job,” Beverly Hills plastic surgeon Dr. Payman Simoni told the magazine, adding that Simpson may not have been the best candidate for the $4,500 procedure. “Overall, Jessica’s experience with plastic surgery does not appear to be flattering,” he said.

Separate from her speculated nose job, fellow Beverly Hills surgeon Dr. William Bruno claims the singer appears to have plumped up her pout ahead of her "I do” kiss.  “It appears she has had a lip filler since her upper lip appears larger now than her lower lip,” said Dr. Bruno. “This ranges from $500 to $700 and lasts up to one year.”

While she has yet to address the pre-wedding makeover rumors, experts estimate that Simpson, who is also rumored to have participated in “fat-freezing” procedures to take away what her workouts and deal with Weight Watchers couldn’t, as well as skin-tightening, and laser-resurfacing, has spent more than $16,000 on her new appearance.

“She worked hard to get her body back,” a “friend” of Simpson’s explained to the magazine, referencing the singer’s four-year struggle with her weight following the birth of her two children with Johnson, Maxwell, 2, and Ace, 11 months. “There were still some things she was insecure about,” added the insider. “Jessica wants to look 10 years younger.”

While Simpson may be a fan of surgical enhancements, her 34-year-old retired football player fiance is reportedly not as convinced the songstress needed the medical assistance. “He thinks she looks perfect the way she is,” said a pal. “He feels she’s the most beautiful woman in the world -- naturally.”

Simpson will tie the knot at Bacara Resort & Spa in Santa Barbara, California, on July 4. The couple announced their engagement in November 2010 after just seven months of dating. 

The singer was previously married to 98 Degrees singer Nick Lachey, now 40. The couple, who starred on three seasons of MTV’s reality series “Newlyweds: Nick and Jessica,” split in 2005 after three years together.