Clint Eastwood and Doris Day at the Golden Globe Awards in 1989: They are neighbours in Carmel Valley and Eastwood reportedly gave Day a script which she loved and is set to have her first film role in almost half a century. Photograph: Ron Galella, Ltd/WireImage

Did you hear what happened when Dirty Harry met Calamity Jane? Movie history, that's what.

Octogenarian actor-director Clint Eastwood has reportedly lured Hollywood's most famous professional virgin, 91-year-old Doris Day, out of retirement for a silver screen swan song.

The two stars are neighbours in Carmel Valley, California, and on a recent visit Eastwood reportedly presented Day with a script.

Citing unnamed sources, Germany's Bild tabloid says Day was delighted with the role and is working out the final details of her first film role in almost half a century...

According to reports, Day has agreed to the project on two conditions: that it is filmed around Carmel, and that a cut of the profits goes to her animal fund.