One is already married and the other currently single, so spotting Cameron Diaz and Gwyneth Paltrow at The Windsor Wedding Show may have come as a surprise to some guests.
The A-listers decided to check out exhibits at the fair, which was located within the Sir Christopher Wren Hotel.
Seen enjoying the cakes, dresses and wedding glitz on show, the pair were also said to be "oohing and aahing" at the displays.
Cameron is currently in the UK filming new Ridley Scott movie The Counsellor.
Image: © Getty