If your week, tragically, did NOT involve perching attractively on a sleek sports car while encircled by Idris Elba’s arm … well, Helen Mirren’s week did, so we’ll just all have to live vicariously. At a London screening of “Fast & Furious Presents: Hobbs & Shaw” — the latest “Fast & Furious” movie, now in theaters and featuring both Mirren and Elba alongside Dwayne “The Rock” Johnson and Jason Statham — Dame Helen was clearly living her best life. And her outfit, featuring a pink-and-green summer frock from the London brand Eponine (available online, and now sold out), is pretty great too.