The Poldark heartthrob and his ex, who split back in 2011, have been pictured looking very cosy at a party in Los Angeles over the weekend.
The 32-year-old appeared to be spending a boozy night with Lenora, 31, in the candlelit photo posted by his co-star Heida Reed - who plays Elizabeth Chenoweth in the BBC period drama.
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Aidan looks relaxed in a white T-shirt while his pretty brunette companion is seen leaning in while dressed in a floaty pink blouse.
"Being humans in Los Angeles," Heida captioned it, before adding a second of the pair surrounded by bottles of Champagne at sunset.
Aidan and Lenora began dating in 2009, after meeting on the set of BBC Three's Being Human, in which they portrayed John Mitchell and Annie Sawyer respectively.
They broke up two years later and the actress continued with her role as a ghost, while he left the show.
Aidan, who had the country swooning after he stripped off as the dashing Ross Poldark, went on to date Sarah Greene for three years.
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He is thought to have been single since they went their separate ways in November 2015, however that might not be the case for long judging by these latest pictures.
One Instagram user asked: "Omggg are they back together?" while another person added: "Unconscious recoupling."
Express.co.uk has contacted a spokesperson for the stars following these reports.