Ashton Kutcher, our most over-Twittering celebrity, has been Tweeting lately about his journey over to France to start filming Five Killers, his action comedy with Katherine Heigl and 21 director Robert Luketic. But even though they're about to start shooting, apparently it's not too late to add some legends to the cast.

Those legends, specifically, are Tom Selleck and Catherine O'Hara, who along with Martin Mull have joined the cast. THR reports that Selleck and O'Hara will get cozy as the overprotective parents of Heigl's character, while Mull will play the handler of Kutcher's former hitman character.

Both O'Hara and Selleck are tragically underused as comic actors, and it's a thrill to see them get pretty much any role, even if it turns out to be the generic kind of parental part. If they also get to head off to France for filming, then Selleck, O'Hara and Mull really have hit the jackpot.