EXCLUSIVE: Mama June, now a size 4, enjoys walking around the house in 'her underwear,' says daughter Pumpkin


Mama June is loving her slimmer figure!

Ahead of her new show, Mama June: From Not to Hot, which premieres Friday on WE tv, ET caught up with the 37-year-old reality star's trainer on the docu-dramedy, Kenya Crooks, who opened up about his client's dramatic physical transformation.

WATCH: Mama June's Weight Loss Surgeries Revealed -- How She Went From 460 Pounds to a Size 4

According to the fitness trainer, the former Here Comes Honey Boo Boo star has been doing a lot of strength training, crunches, plyometrics and running after undergoing multiple weight-loss surgeries.

38 PHOTOS
Mama June through the years
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Mama June through the years
ATLANTA, GA - MAY 23: TV personality Mama June attends the 'Growing Up Hip Hop Atlanta' premiere at Woodruff Arts Center on May 23, 2017 in Atlanta, Georgia. (Photo by Marcus Ingram/WireImage)
ATLANTA, GA - MAY 23: TV personalities Honey Boo Boo and Mama June attend the 'Growing Up Hip Hop Atlanta' premiere at Woodruff Arts Center on May 23, 2017 in Atlanta, Georgia. (Photo by Marcus Ingram/WireImage)
NEW YORK, NY - APRIL 06: Mama June appears on The Jenny McCarthy Show at SiriusXM Studios on April 6, 2017 in New York City. (Photo by Rob Kim/Getty Images)
NEW YORK, NY - APRIL 06: Mama June visits at SiriusXM Studios on April 6, 2017 in New York City. (Photo by Rob Kim/Getty Images)
NEW YORK, NY - APRIL 06: Mama June (L) and Jenny McCarthy appear at SiriusXM Studios on April 6, 2017 in New York City. (Photo by Rob Kim/Getty Images)
NEW YORK, NY - APRIL 05: (L-R) Mama June, AJ Calloway, and Honey Boo Boo pose on the set of 'Extra' on April 5, 2017 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - APRIL 05: Mama June visits 'Extra' on April 5, 2017 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - APRIL 05: Mama June visits 'Extra' on April 5, 2017 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
NEW YORK, NY - APRIL 05: Mama June (L) and daughter Honey Boo Boo visit 'Extra' on April 5, 2017 in New York City. (Photo by D Dipasupil/Getty Images for Extra)
LOS ANGELES, CA - JANUARY 18: Honey Boo Boo and her mom Mama June along with sister Pumpkin in Beverly Hills, Ca on January 18, 2016 in Los Angeles, California. (Photo by Light Brigade/Bauer-Griffin/GC Images)
LOS ANGELES, CA - OCTOBER 15: June Shannon and Alana 'Honey Boo Boo' Thompson are sighted at The Grove on October 15, 2012 in Los Angeles, California. (Photo by Noel Vasquez/FilmMagic)
NEW YORK, NY - JULY 15: June Shannon attends the 'How To Honey Boo Boo: The Complete Guide' Book Event on July 15, 2013 in New York, New York. (Photo by Rob Kim/Getty Images)
MCLEAN, VA- July 11: Mike 'Sugar Bear' Thompson attends the 'How to Honey Boo Boo: The Complete Guide' Book Event at the Barnes and Nobles on July 11, 2013 in Mclean, Virginia. (Photo by Kris Connor/Getty Images)
UNIVERSAL CITY, CA - SEPTEMBER 09: Mike Thompson (L) and June Shannon visit 'Extra' at Universal Studios Hollywood on September 9, 2013 in Universal City, California. (Photo by Noel Vasquez/Getty Images for Extra)
ATLANTA, GA - JANUARY 05: Alana 'Honey Boo Boo' Thompson and Mama June Shannon attend the ATL Premiere Of WE Tv's 'Growing Up Hip Hop' at SCADshow on January 5, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
HOLLYWOOD, CA - NOVEMBER 19: (L-R) TV personalities Lauryn 'Pumpkin' Thompson, Mike 'Sugar Bear' Thompson, Alana 'Honey Boo Boo' Thompson and June 'Mama June' Shannon attend We tv's celebration of the premieres of 'Marriage Boot Camp Reality Stars' and 'Ex-isled' at Le Jardin on November 19, 2015 in Hollywood, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - OCTOBER 15: Alana 'Honey Boo Boo' Thompson and her mother June Shannon (R) visit 'Extra' at The Grove on October 15, 2012 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images for Extra)
UNIVERSAL CITY, CA - SEPTEMBER 09: Mike Thompson visits 'Extra' at Universal Studios Hollywood on September 9, 2013 in Universal City, California. (Photo by Noel Vasquez/Getty Images for Extra)
NEW YORK, NY - APRIL 04: Alana Thompson aka. Honey Boo Boo and June Shannon aka. Mama June seen out in Manhattan on April 04, 2013 in New York City. (Photo by Josiah Kamau/BuzzFoto/FilmMagic)
LOS ANGELES, CA - OCTOBER 15: Alana 'Honey Boo Boo' Thompson and her mother June Shannon (L) visit 'Extra' at The Grove on October 15, 2012 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images for Extra)
UNIVERSAL CITY, CA - SEPTEMBER 09: Mike Thompson (L) and June Shannon visit 'Extra' at Universal Studios Hollywood on September 9, 2013 in Universal City, California. (Photo by Noel Vasquez/Getty Images for Extra)
Mama June and Sugar Bear
Mama June and Sugar Bear
UNIVERSAL CITY, CA - SEPTEMBER 09: June Shannon visits 'Extra' at Universal Studios Hollywood on September 9, 2013 in Universal City, California. (Photo by Noel Vasquez/Getty Images for Extra)
Honey Boo Boo and family dressed as the Kardashians.
LOS ANGELES, CA - NOVEMBER 18: Mama June and Honey Boo Boo are seen at LAX on November 18, 2015 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
Honey Boo Boo and family
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0073 -- Pictured: (l-r) Television personalities Mama June and Honey Boo Boo during an interview with host Jimmy Fallon on June 11, 2014 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0073 -- Pictured: (l-r) Television personality Honey Boo Boo during an interview with host Jimmy Fallon on June 11, 2014 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
GOOD MORNING AMERICA - Honey Boo Boo and Mama June (Here Comes Honey Boo Boo) are guests on 'Good Morning America,' 2/5/14, airing on the ABC Television Network. (Photo by Fred Lee/ABC via Getty Images) AMY ROBACH, MAMA JUNE, HONEY BOO BOO
NEW YORK, NY - JULY 15: Honey Boo Boo's mother June Shannon attends the 'How To Honey Boo Boo: The Complete Guide' Book Event on July 15, 2013 in New York, New York. (Photo by Charles Norfleet/FilmMagic)
MCLEAN, VA- July 11: June 'Mama' Shannon attends the 'How to Honey Boo Boo: The Complete Guide' Book Event at the Barnes and Nobles on July 11, 2013 in Mclean, Virginia. (Photo by Kris Connor/Getty Images)
MCLEAN, VA- July 11: Alana 'Honey Boo Boo' Thompson attends the 'How to Honey Boo Boo: The Complete Guide' Book Event at the Barnes and Nobles on July 11, 2013 in Mclean, Virginia. (Photo by Kris Connor/Getty Images)
JIMMY KIMMEL LIVE - 'Jimmy Kimmel Live' airs every weeknight, (12:00 - 1:06 a.m., ET), following 'Nightline,' packed with hilarious comedy bits and features a diverse lineup of guests including celebrities, athletes, musicians, comedians and humorous human interest subjects. The guests for MONDAY, OCTOBER 15 included actor Aziz Ansari ('Parks and Recreation'), Alana 'Honey Boo Boo' Thompson and June 'Mama' Shannon ('Here Comes Honey Boo Boo') and musical guest Josh Turner. (Photo by Richard Cartwright/ABC via Getty Images) JUNE 'MAMA' SHANNON, ALANA 'HONEY BOO BOO' THOMPSON, JIMMY KIMMEL
LOS ANGELES, CA - OCTOBER 15: Alana 'Honey Boo Boo' Thompson and her mother June Shannon (L) visit 'Extra' at The Grove on October 15, 2012 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images for Extra)
Honey Boo Boo színre lép (3. évad)
MCLEAN, VA- July 11: June 'Mama' Shannon, Mike 'Sugar Bear' Thompson, Alana 'Honey Boo Boo' Thompson, Anna 'Chickadee' Shannon and Lauryn 'Pumpkin' Shannon attend the 'How to Honey Boo Boo: The Complete Guide' Book Event at the Barnes and Nobles on July 11, 2013 in Mclean, Virginia. (Photo by Kris Connor/Getty Images)
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"The cool thing is, you get to see her transformation not only from a physical standpoint, but you also get to see her change here, you know, from a mental standpoint," Kenya explained to ET's Jennifer Peros on Wednesday. "Because at first, I don't want to tell too much about the show, but at first, she was doing it for different reasons, but, as you will see throughout the episodes, it's more about her now."

ET also caught up with Mama June's daughters, 17-year-old Lauryn "Pumpkin" Thompson and 11-year-old Alana "Honey Boo Boo" Thompson, who revealed their mother is happier than ever -- and much more confident!

"I ain't trying to be like R-rated or anything, but she walks around the house in a pair of her underwear now, so...," Pumpkin joked. "Uh huh. I'm like, 'June, put some pants on! Put some pants on!'"

WATCH: Mama June Documents Extensive Plastic Surgery, Body Transformation in New Show 'From Not to Hot'

Pumpkin told ET that despite Mama June's total body transformation, there's still some days when she sees the old version of herself.

14 PHOTOS
Mama June and Pumpkin, "Here comes Honey Boo Boo"
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Mama June and Pumpkin, "Here comes Honey Boo Boo"
(photo credit: Inside Edition)
(photo credit: Inside Edition)
(photo credit: Inside Edition)
(photo credit: Inside Edition)
(photo credit: Inside Edition)
(photo credit: Inside Edition)
I don't know but I think I maybe Fallin' for you dropping so quickly Maybe I should keep this to myself Waiting 'til I know you better I am trying not to tell you But I want to I'm scared of what you'll say So I'm hiding what I'm feeling But I'm tired of holding this inside my head
Come hangout with us in Albany the whole honey boo boo clan is here. The Albany Exchange Fair Grounds: Wing Feast.
GOOD MORNING AMERICA - Honey Boo Boo and Mama June (Here Comes Honey Boo Boo) are guests on 'Good Morning America,' 2/5/14, airing on the ABC Television Network. (Photo by Fred Lee/ABC via Getty Images) 
June Shannon appears at a "How To Honey Boo Boo: The Complete Guide" book event, held at Barnes & Noble Citigroup Center, New York
June Shannon attending the 24th GLAAD Media Awards at the Marriott Marquis Hotel in New York.
NEW YORK, NY - JULY 15: Honey Boo Boo's mother June Shannon attends the 'How To Honey Boo Boo: The Complete Guide' Book Event on July 15, 2013 in New York, New York. (Photo by Charles Norfleet/FilmMagic)
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"Momma's doing really good," Pumpkin said. "I think that her biggest [insecurity] that she still has to [get over] is that fact of, I think she still thinks of herself as a bigger person. Because, even to this day, like a couple of days ago, we had a conversation, and she is like... she looked in the mirror and was like, 'I'm still fat.' And I guess because she's seen herself as a bigger person all these years, she doesn't realize how small she is."

"She tries to wear bigger clothes and baggier clothes and stuff like that, and we're like, 'You're small, like wear something, you know, tight-fitting,'" she added.

That may explain why her wardrobe still consists of loose-fitting clothes.

"She doesn't want to [buy new clothes]," Pumpkin revealed.

WATCH: Mama June Drops Down to a Size 4 After Weighing 352 Pounds

Kenya chimed in, telling ET, "That's what she's used to doing."

"When you're a bigger person, that's how you disguise all of that, through wearing bigger clothes," he dished. "So now, we're having to transform her mind even more, because she has curves now, she looks awesome."

And while Mama June clearly looks different on the outside -- which fans will get to see during the finale of the seven-part series! -- Pumpkin and Honey Boo say she's still the same, "just smaller."

"I'm really happy for her because I think she's always seen herself as a small person," Pumpkin exclaimed. "Even though now she's having a hard time realizing that she is a small person, I think that she's always, within that big person, that she's always been, she's always seen the smaller person."

"[Hugging her is] so different," said Honey Boo Boo, adding that her mom is kind of crazy about getting on the scale every day. "I can wrap both my arms around her."

WATCH: Mama June Says Sugar Bear Cheated on Her With Men and Women

"I kind of didn't want her to do it at first," she continued, "but after she [did] it, I'm very happy with it and how she turned out."

Kenya also told ET that he's been lecturing Mama June on the importance of keeping up with her diet and fitness routine in order to maintain her trimmed-down figure. Luckily, her daughters have been keeping her in check.

"Most of the time I'm up late at night anyways, but I tell her like, 'Momma, you can't do that,'" Pumpkin said about monitoring her mom's late-night snacking habit. "I have to show her [old] pictures of her sometimes, and she's like, 'I can't even believe that's me.' I'm like, 'If you don't stop eating that junk, you're going to go right back!'"

WATCH: Inside Mama June's Diet and Exercise Plan That Led to Her Stunning Weight Loss

13 PHOTOS
Most notable celebrity weight loss transformations
See Gallery
Most notable celebrity weight loss transformations

John Goodman - 1991

Cheerful John Goodman in a scene from the film 'Barton Fink', 1991. (Photo by 20th Century-Fox/Getty Images)

John Goodman - 2015

John Goodman attends the 'Trumbo' Accenture Gala during the BFI London Film Festival at Odeon Leicester Square on October 8, 2015 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

Khloe Kardashian - 2007

Khloe Kardashian at the 'Keeping Up With The Kardashians' premiere party on October 9, 2007 in West Hollywood, California. (Photo by Jeff Vespa/WireImage) 

Khloe Kardashian - 2015

Khloe Kardashian appears At ULTA Beauty's West Hills Store To Promote Kardashian Beauty Hair Care And Styling Line at ULTA Beauty on April 2, 2015 in West Hills, California. (Photo by Frazer Harrison/Getty Images)

Jennifer Hudson - 2010

Jennifer Hudson during 'A Fine Romance' Gala Benefiting the Motion Picture and Television Fund - Arrivals at Sunset Gower Studios in Hollywood, California, United States. (Photo by Jon Kopaloff/FilmMagic)

Jennifer Hudson - 2015

SingerJennifer Hudson attends the Marchesa fashion show during Spring 2016 New York Fashion Week at St. Regis Hotel on September 16, 2015 in New York City. (Photo by Gary Gershoff/WireImage)

Jonah Hill - 2006

Jonah Hill during Universal Pictures Presents the World Premiere of 'Miami Vice' at Mann Village Theater in Westwood, California, United States. (Photo by E. Charbonneau/WireImage)

Jonah Hill - 2012

Actor Jonah Hill attends the premiere of 'The Watch' at Grauman's Chinese Theatre on July 23, 2012 in Hollywood, California. (Photo by Jason LaVeris/FilmMagic)

Kelly Osbourne - 2002

Kelly Osbourne, daughter of rocker Ozzy Osbourne at St Martin's Lane Hotel, London, August 21, 2002. Kelly, along with brother Jack, mother Sharon and father Ozzy, are the stars of their own reality television show, 'The Osbournes'. (Photo by Gareth Davies/Getty Images)

Kelly Osbourne - 2015

Special guest Kelly Osbourne celebrates the opening of the new Cost Plus World Market Chelsea, New York store on August 18, 2015 in New York City. (Photo by Jamie McCarthy/Getty Images for World Market)

Chaz Bono - 2010

Chaz Bono arrives at the 21st Annual GLAAD Media Awards held at Hyatt Regency Century Plaza on April 17, 2010 in Century City, California. (Photo by Angela Weiss/Getty Images)

Chaz Bono - 2015

Chaz Bono visit 'Extra' at Universal Studios Hollywood on July 28, 2015 in Universal City, California. (Photo by Noel Vasquez/Getty Images)

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