Fergie, Duchess of York, looks slimmer than ever in skintight black dress

Sarah Ferguson, "Fergie," has always been criticized in the media for her up-and-down dieting and fluctuating figure, but these days former royal is looking better than ever.

The 56-year-old Brit looked absolutely stunning in a skintight black dress at a gala in Marbella Spain, over the weekend. The Duchess of York's gown hugged her curves and showed off her trim physique. The gown was belted at the center, and featured off-the-shoulder sleeves, further accentuating her hourglass figure. She wore her flame-colored tresses down and polished.

Over the past couple years, Fergie has been making a dedicated effort to keeping a fit physique in top shape and has looked incredible. In 2015, she revealed to Rachael Ray that she lost 55 pounds by eating a farm-to-table diet and cutting out a lot of junk food, and exercising by walking and hiking daily. She said she had gotten to a very low point before that and just decided it was time to turn her life around, and clearly she has.

Fergie's been traveling on royal business, promoting her new line of teas, and just seemingly enjoying life -- and she's absolutely glowing.

Hopefully she'll be able to lend some of that glow to her daughter, Princess Beatrice, who just broke up with her boyfriend of nearly 10 years, David Clark. Beatrice reportedly left her investment banking job in New York City where her boyfriend lives and works as well, but she's yet to return to the U.K. Details on why and how their relationship ended still remain short, but the royals were apparently "shocked by the news."

Despite the breakup news of her daughter, it appears nothing can get Fergie down!

PHOTOS: Sarah Ferguson through the years