Reuters

By FOX News Magazine

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While the world was eyeing the Super Bowl (or the Puppy Bowl, depending who you ask), one country singer was too busy flaunting her svelte self in an itsy bitsy white bikini.

READ: How LeAnn Rimes Made Trace Adkins Cry

Earlier this month, LeAnn Rimes was all smiles flaunting her flat stomach while frolicking in a Hawaiian beach.  And as with fellow blonde crooner Miranda Lambert, everyone wants to know the 31-year-old’s secret to weight loss success.

PHOTOS: Miranda Lambert's Amazing Body Transformation

Rimes’ body transformation was no easy task. While some accused her of having an eating disorder, Rimes says her drastic weight loss was simply a side effect of the stress she was experiencing when she was dating her now-husband, actor Eddie Cibrian, both of whom were married to other people at the time.

In 2011, Rimes and her fitness trainer Michael Jackson credited boxing with helping her cope with anxiety, as well as geting into shape. Jackson also told FOX411.com that Rimes visited the gym 3-4 times a week for an hour and a half session.

READ: Christina Aguilera Dishes on Weight Loss Secret

“For a typical workout, we warm up with about 5-10 minutes of jump rope,” explains Jackson. “Then we’ll get going with some light, dynamic stretching. But LeAnn usually likes to start boxing first…We’ll also work on the core, legs, and hips. We do arms more than anything. I know a lot of people think boxing is just punching, but proper technique involves working out the quads, butt, back, and core."

In addition to boxing and strength training, including lunges, weights, and squats, Jackson says Rimes follows a strict diet, consisting of all-natural, unprocessed foods.

READ: How Kim Kardashian Got Her Bikini Body Back

“She eats a lot of lean meats -- fish, chicken, maybe on occasion, lean turkey,” says Jackson. “A lot of vegetables -- broccoli, carrots, and asparagus. And I try to have LeAnn eat some fruit, like oranges and apples, before 3 o’clock. The reason for that is because fruits contain a lot of sugar, and sugar metabolizes into carbs, so I try to have eat that before she really gets active. Fruits are a good source of energy, much better than energy drinks.”

Rimes is allowed to have a cheat meal, but only once a week. And as for gaining a pound or two? No big deal, especially when you have the right support system.

PHOTOS: Snooki 'Shore' Looks Slimmer, Huh?

“Now I’m secure about my body, although I’m like any other woman and have my moments of self doubt,” Rimes told the Daily Mail in 2013. “But it’s nice to have a husband who tells you you’re beautiful all the time. I’ll say to him, ‘I’ve gained a few pounds,’ and he’ll say, ‘Good!’”

Check out Rimes’ body transformation for yourself below:

  

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1996

Holding hands with Country Music Awards ceremony host Vince Gill after performing her hit single "Blue" in Nashville. 

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1997

The 14-year-old poses with her Grammys at Madison Square Garden.

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1998

Arriving at the Billboard Music Awards in Las Vegas. 

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1999

Posing for photographers at the 26th annual American Music Awards in Los Angeles.

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2000

Performing her single "I Need You" at the Grand Ole Opry House in Nashville.

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2001

Posing with her then-fiance, actor Andrew Keegan, at the 12th annual Gay & Lesbian Alliance Against Defamation (GLADD) Media Awards in Los Angeles.

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2002

Presenting at the 37th annual Academy of Country Music Awards in Los Angeles.

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2003

Performing "Love is an Army" at the 38th Annual Academy of Country Music Awards in Las Vegas.

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2004

Performing "Probably Wouldn't Be This Way" at the 39th annual Academy of Country Music Awards in Las Vegas.

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2005

Arriving at the 14th annual Ella awards in Beverly Hills.

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2006

Walking the runway during the Heart Truth Red Dress fashion show at New York Fashion Week.

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2007

Arriving at the 41st annual Country Music Awards in Nashville.

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2008

Arriving at the 43rd Annual Academy of Country Music Awards show in Las Vegas.

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2009

Accepting the Humanitarian Award at the 44th Annual Academy of Country Music Awards in Las Vegas.

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2010

Arriving at the 45th annual Academy of Country Music Awards in Las Vegas with actor, Eddie Cibrian.

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2011

Arriving at the 53rd annual Grammy Awards in Los Angeles.

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2012

Appearing at the 47th annual Academy of Country Music Awards in Las Vegas.

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2013

Posing backstage during the 4th annual American Country Awards in Las Vegas.

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2014

Performing "Hi-De-Ho (That Old Sweet Roll)" with Steven Tyler during the 2014 MusiCares Person of the Year tribute honoring Carole King in Los Angeles.