Isla Fisher is not inviting Owen Wilson and Vince Vaughn to her wedding to see if they crash it.

The 32-year-old actress - who is engaged to 'Borat...' star Sacha Baron Cohen - wants to test her 'Wedding Crashers' co-stars to see if they live up to their characters from the film.

She joked: "I'm thinking of not inviting Owen and Vince to our wedding so I can see whether they can crash our wedding."

Isla - who stars in new romantic comedy 'Definitely, Maybe' - has converted to Sacha's Jewish faith so they can marry in a traditional ceremony and is pleased with her decision.

She said: "I love religions and find them fascinating and I find Judaism very beautiful. It has enriched my life enormously."

The red-headed star has a four-month-old daughter, Olive, with Sacha.