Emma Stone and Austin Stowell have reportedly been flirting on the set of their new movie.
The 27-year-old actress has been linked to her 'Battle of the Sexes' co-star and it has been claimed that the pair are "inseparable" with castmates teasing them about their chemistry.
A source told US Star magazine: "Emma and Austin are inseparable. There's a real connection there. They have the same sense of humour and are constantly teasing each other in between takes about how sexy they look in the funky 1970s-inspired get-ups they have to wear.
"The cast and crew are always saying what a cute couple they make. Emma and Austin try to brush it off, but you should see the way they blush!"
Emma and Austin play husband and wife in the biopic which tells the story of Billie Jean King's history making tennis match against Bobby Riggs.
Emma split from Andrew Garfield, 32, for the second time last year but the pair have remained good friends.
A source said: "They still have a lot of love for one another and they are on good terms with each another and remain close. It just wasn't working."
Another insider added: "There was no drama, they've been apart while working. They still care about each other.
"They still have love for one another. They are on good terms with each other and remain close."
And Austin, 31, and Nina Dobrev, 27, ended their seven-month relationship in February because they were both too busy to see each other.
A source said: "It started to get hard with both of their schedules. They remain on good terms."