The former reality star and model is newly svelte thanks to her brand new lifestyle.
According to a source, Gastineau, 36, was overheard at the 25th Annual InterContinental Miami Make-A-Wish Ball on Nov. 2 attributing her noticeable weight loss to the fact she just celebrated being 90 days sober.
And though she looked great, her mom, Lisa, also had slimmed down — but for a very different reason!
According to the source, Brittny’s mother lost a $10,000 diamond earring the night of the charity event.
Despite the loss, the pair helped Make-A-Wish raise an impressive $3 million.