Mama June Crashes Sugar Bear's Wedding in 'From Not to Hot' Finale -- See Her Red - Hot Style!

The reality star was uninvited one moment, and walking through the wedding tent the next!

Mama June's entire weight loss journey revolved around Sugar Bear's wedding, but on Friday's season finale of From Not to Hot, she discovered she was disinvited from the ceremony.

June's daughter, Alana "Honey Boo Boo" Thompson delivered the news to her mom, who was already heartbroken after getting denied by her date.

EXCLUSIVE: Mama June Reveals Exactly How Much She Weighs Today After Stunning Transformation

"Before you got your neck and arm surgery, Jennifer Skyped me and said that you couldn't come," the 11-year-old explained. "You had the dang photo shoot and I didn't want to make you upset."

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WATCH: Mama June's Plastic Surgeries Could Have Cost Her More Than $50K

Mama June wasn't the only one upset by Jennifer's decision to leave her without an invite, however, as Honey Boo Boo sulked around until her parents decided to make a truce.

"I don't really care about going to damn Sugar Bear's wedding, but I know how important it is to Alana. I've gotta do something. I've got to fix this," Mama June said to the camera, before a quick call to her ex gets her re-invited to the wedding. "

"This was all about revenge for Sugar Bear, but now it's about something more important. It's about being there for Alana when she walks her father down the aisle."

With that, it's time for June to get ready, and finally put on the size 4 red dress she'd been working toward.

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As she comes down the stairs, Mama June is surprised to find out that she has a date after all: her trainer, Kenya. "Thank God," she exclaims, before they pile into the car to head to Sugar Bear's wedding in McIntyre, Georgia, which has already been engulfed by a storm.

"When I left this town, I weighed 450 pounds, and now I'm a size 4," Mama June said as they made the hour-long drive to the house she shared with Sugar Bear. "Their mouths are going to drop."

The first mouth to drop was Sugar Bear, who after making peace, decided to invite his ex inside for a little chat.

"I have to say thank you in a way, because at first, I was doing this transformation to kind of like, show you that I could do it and make myself a better person, and show myself that was worth something. But then I decided through this journey that it wasn't about you, and it wasn't about everything that I've been through with you. It was about me. So now, thanks to you, I have lost for myself, and I will never go back to the way I was," June said, before a horrified Jennifer stormed inside, called her a "b*tch" and asked her to leave.

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WATCH: Mama June Seen for the First Time Since Size 4 Reveal -- See the Pic!

Instead of starting a fight, however, Mama June decided to be the bigger person -- "or smaller person" -- and left the house to wow her disgruntled family members sitting inside the tent.

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Jennifer and Sugar Bear eventually made it down the aisle to say "I do," but only after shocking their guests with a makeout session at the altar.

"It was like a woolly mammoth eating a god damn fish," Mama June recalled.

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WATCH: Mama June's Amazing Weight Loss Transformation: A Complete Timeline From 460 Pounds to 160!

With that, it was time to celebrate the new Mama June -- by burning her old clothes.

"If you keep looking back, you'll never look forward," she explained as she tossed her XXL shirts into the fire.

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EXCLUSIVE: Inside Mama June's New Life: Exercise, Eating and Dating Following Total Body Transformation!

Mama June has finally accepted her new body, but her new body might not have accepted her.

Next week's From Not to Hot sees Mama June in the emergency room due to possible complications from surgery. Find out what happened next Friday at 9 p.m. ET/PT on WE tv.

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ET caught up with Mama June in New York on Tuesday, where she said attending her ex's wedding was "awkward."

"I told him that he made me feel like sh*t, honestly," she recalled.

See more in the video below.

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