January Jones modeled her fit physique in a black-and-white bikini marking the end of summer.

The “Mad Men” alum, 48, was pictured in a series of swimsuit snaps wearing a black halter bikini with white trim details.

Jones smiled sweetly for the bathroom mirror selfie, wearing her shoulder-length blond hair down and opting for a natural look.

In another snapshot, the actress wore a black-and-white striped one-piece swimsuit, pulling her wet hair back to show off the look. And in a third, she rocked what appeared to be a pink and black two-tone bikini top with a sheer, lace-lined coverup.

“☀️👙 almost time for the sweaters but not quite yet,” she…

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