Gisele Bundchen, Tom Brady at 'Superheroes: Fashion and Fantasy' Costume Institute Gala at The Metropolitan Museum of Art - Departures. New York City, USA - 050508

The couple has been dating since Brady split from actress Bridget Moynahan in 2006 and now they're planning on taking their romance to the next level.

One insider tells In Touch magazine, "There will be no engagement, just a small wedding in mid-March."

And the source claims the top secret ceremony will take place in Costa Rica, where the Brazilian model has a vacation home.

Source: WENN