Jon Hamm is reportedly dating his former Mad Men co-star Anna Osceola

Jon Hamm has reportedly struck a romance with his former Mad Men co-star Anna Osceola.

Hamm, 49, and Oscoela, 32, initially sparked rumours they were dating when they were spotted together numerous times during isolation. But Us Weekly has now confirmed that the pair are an item.

The duo, who starred together in the season finale of Mad Men in 2015, were seen having a tennis match in May this year.

In photos obtained by The Daily Mail on May 22, the Mad Men alum wore masks and walked from their car to the tennis court in Los Angeles.

They were also spotted having an outing together on May 23, with a Twitter user sharing a snap of them getting close. "He keeps her hidden," the social media commentator captioned the image.

Late last year, Hamm was believed to be dating Saturday Night Live producer Lindsay Shookus.

"The two sat next to each other and Jon was right next to the aisle," a source told Us Weekly in September. "They weren't hiding anything! Lindsay and Jon didn't show much PDA, but there was definitely some flirtatious banter."

Hamm previously dated Jennifer Westfeldt between 1997 to 2015.

"With great sadness, we have decided to separate, after 18 years of love and shared history. We will continue to be supportive of each other in every way possible moving forward," the exes said in a statement in September 2015.

You can stream every episode of Mad Men on Stan.