This weekend, more than 20 years after his last extraterrestrial-focused feature, Steven Spielberg returns to his roots with Disclosure Day. The movie draws from the filmmaker's career-spanning fascination with the possibility that life exists somewhere other than Earth.

Here's a rundown of 21 celebrities who believe aliens are real, and what they've said about our extraterrestrial neighbors. "It’s my first film that will be considered science fiction that I do not consider to be science fiction,