Mad Men Alum January Jones, 48, Wows in Classic Black-and-White Bikini in End-of-Summer Snap

January Jones is pushing back against sweater weather.

The “Mad Men” alum, 48, posted a bikini photo set Wednesday with a caption that made her stance on summer’s end unmistakably clear.

‘Mad Men’ alum January Jones, 48, wows in classic black-and-white bikini in end-of-summer snap

“☀️👙 almost time for the sweaters but not quite yet,” she wrote alongside the upload.

The snapshots showed Jones in multiple swimwear looks. In one bathroom mirror selfie, she smiled wearing a black halter bikini with white trim, her shoulder-length blond hair down and her makeup natural. Another photo captured her in a black-and-white striped one-piece, wet hair pulled back to display the suit. A third image featured what appeared to be a pink and black two-tone bikini top paired with a sheer, lace-lined coverup.

Fans flooded the comments with praise. “Thanks for shifting my concentration,” one person quipped. Another remarked, “Beautiful as always.” A third gushed, “The world’s hottest, at it again. ❤️🔥.” Others responded with rows of heart and flame emojis.

‘Mad Men’ alum January Jones, 48, wows in classic black-and-white bikini in end-of-summer snap

This was not the first time Jones has used a bathroom selfie to showcase her physique. In August 2025, she modeled nude underwear in another jaw-dropping pic. “Knees are weak, sleep is sweaty, attitude petty…never let my strength leave me,” she captioned that photo.

‘Mad Men’ alum January Jones, 48, wows in classic black-and-white bikini in end-of-summer snap

Despite the glam presentation, Jones — mother to son Xander Jones, 14 — has long maintained that her approach to diet and fitness avoids rigidity. “I don’t deprive myself of anything,” she told Shape back in 2020. “If I want something — steak, a bagel — I’ll eat it.”

She added, “There’s no diet or strict set of rules.”

‘Mad Men’ alum January Jones, 48, wows in classic black-and-white bikini in end-of-summer snap

The “Anger Management” actress has also been candid about prioritizing comfort over public perception. She recalled attending a birthday party with her son while wearing “humongous red sweatpants” — an outfit choice her sister called her out on. Jones remembered that she paused, but still opted for the sweatpants. “Who cares? They’re my period pants!” she said.

She noted that she feels “comfortable” in her skin, and that “public opinion doesn’t matter to me.”

‘Mad Men’ alum January Jones, 48, wows in classic black-and-white bikini in end-of-summer snap

Jones worked out several times a week, though she has never claimed to follow any strict exercise regimen.

‘Mad Men’ alum January Jones, 48, wows in classic black-and-white bikini in end-of-summer snap

Jones next appears in the upcoming series “The Politician.”

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