Julie Chen Moonves is proud of all the relationships that have blossomed on Big Brother. Speaking exclusively with PEOPLE in honor of the show's 25th anniversary, Chen Moonves, who has hosted Big Brother since it premiered on July 5, 2000, bragged about the show's track record for successful romances.

This season's theme is "A Summer of Mystery," featuring a masked visitor, a secret accomplice and a mystery houseguest.

The hit reality series Big Brother returns for its 27th season called “A Summer of Mystery.” Sixteen new house guests and a mystery player will check into the Hotel Mystère, but only one will check out with the $750,