Staying for less than 24 hours, the pair attended the Rio de Janeiro premiere and both dazzled on the red carpet.
Tom, of course, posed for numerous photos with the crowd, and even bounced a football off his head for a fan.
Diaz squeezed in a helicopter tour of Rio while she was there too, looking gorgeous in her off-duty wardrobe of ankle grazers, blouse and a chic white trilby hat.
The pair was scheduled to leave for Mexico after the premiere.
By Leanne Bayley
SEE TEASER OF KNIGHT & DAY HERE