The post also tagged the official Vikings account. Even though the image was supposedly posted eight hours previously, there is no knowing when it was shared.
Fans are wondering whether the post is real, as they have still not seen an official trailer for the second half of season six.
While one fan said: “Hope this is true”, another fan said: “Doubt it…there would be a trailer already”.
While viewers are yet to hear any official news about a release date, there is a high chance Amma will return for the final episodes, as her Instagram bio still says she plays the character in the series.
Sadly she has not shared any Vikings-related content for a while, with her last post being back in February 2020.
One fan commented on the photo of the star as Amma saying: “Hope to see more Amma in the near future!”