January Jones turned up the heat on Sunday when she showcased her enviably slim figure on Instagram. The 42-year-old, who is famed for playing Betty Draper in the hit series Mad Men, happily flaunted her phenomenal physique in a coral coloured swimsuit.

The sexy one-piece boasted a plunging neckline, halter-neck detail and was cinched in at the waist with a belt. She teamed the look with large, retro sunglasses and a gold pendant necklace.