United Kingdom, June 9 -- Eve Hewson is convinced Steven Spielberg and Barack Obama are in a "secret alien society" together.

The 34-year-old actress was shocked when the former US President turned up on the set of her new movie, epic sci-fi thriller Disclosure Day, to watch her and her co-stars - who include Colin Firth, Emily Blunt, Josh O'Connor and Colman Domingo - shoot scenes.

Obama's appearance on the set of the movie - which tells the story of a race to expose a huge government conspiracy regarding extra-terrestrial life - got Eve thinking that the film's director, Spielberg, who has also helmed E.T. and War of the Worlds, and Obama may have "bonded over a mutual interest".

Speaking on The Tonight Show with Jimmy Fallon, she sa...