Martha Stewart stuns in makeup-free lingerie look as she reveals secrets to her youthful glow at 84

Draped in pale blue, lace-trimmed lingerie and a matching robe, Stewart paired the barely-there look with gold earrings and her signature stylish blowout.

Stewart said her skincare routine begins the night before, then shifts to contrast therapy in the morning using a hot towel to open her pores and a cold compress to tighten them back up.

"This just calms my skin," she said. "And it makes me feel fresh."

Her approach to beauty, she added, starts well beneath the surface. 

Stewart took some skin supplements from her brand, Elm Biosciences, underscoring her long-held belief that skincare is an inside-out equation.

"My whole theory with skincare is inside, outside," she said. "Whatever you put inside reflects what's coming on the outside."

From there, Stewart applied a night cream, then finished with a mineral sunscreen.

When it comes to makeup, the former model has never chased heavy coverage. 

Instead, she opts for radiance, using L'Oréal Lumi Glotion as her base, followed by a mix of Charlotte Tilbury bronzer, a luminous blush from Mac, Lancôme highlighter and Armani Beauty liquid eyeshadow.

"I like to glow. I don't like matte finishes on pretty much anything," Stewart said. "I like my furniture to be shiny. I like my face to be shiny."

While she gave fans a rare glimpse of her intricate, yet glamorous, beauty regimen, Stewart has also recently laid down rules for aging well.

Stewart previously said she treats aging as a discipline, not a decline, as she continues to run businesses, stay physically active and take on new creative projects well into her 80s. 

She shared that perspective during a recent appearance on the "50 & Unfiltered" podcast, where she spoke with longtime friend and QVC host Shawn Killinger about wellness, resilience and staying relevant with age.

Among the seven principles she outlined, Stewart stressed that mindset matters just as much as maintenance.