The party is being organised Saturday to celebrate Queen Elizabeth's 60 years on the throne.
"Brad and Angelina are aware of the celebrations. They have had information sent to them and shown an interest," a website quoted a source close to the planning committee of the Tea Party.
"Brad and Angelina love England and have been made to feel very welcome in Richmond. They want to fully embrace the Jubilee celebrations. The kids are very excited," another source added.
The event will include a father-and-son tug of war competition, a cricket match, face painting, children's soccer game and a cake baking contest and local residents are hoping the showbiz couple will join in the fun.
"This whole event is very much a community-driven one. We'd be delighted if Brad and Angelina came," organiser Emma Gibbons told a magazine.