Gina Riley and Jane Turner, the creators and leading ladies of the Australian comedy television show, had been shooting scenes for the upcoming film in Venice. However, production has now relocated to Victoria.
According to the Herald Sun, Turner and Riley were spotted in Italy alongside cast members Magda Szubanski, Glenn Robbins and Peter Rowsthorn during the three-week shoot.
They are also believed to have filmed several scenes with Withnail and I star Richard E Grant before he travels to Melbourne to complete his character's storyline. He was first linked to the project in August.
Rob Sitch - who is best known for his roles in The Dish, The Hollowmen and Frontline - is now believed to be making a special appearance in the movie after he was spotted on the Melbourne set.
During filming in Italy, the character Kim was heard saying: "The men are all over me. The looks I'm getting. I've done all the ruins and now I'm being ogled by the locals. Sharon's pouncing on guys. It's sad. They've got fear in their eyes."
One of Kath's lines already filmed is: "Fashion-wise, I think we're teaching the Italians a few things. High jeans and 12-inch zippers - I don't think they've seen those before."
> Kath and Kim to perform at festival
> New 'Kath and Kim' project in works
Producers have described the film as "a whirlwind trip overseas that becomes a tale of love, lust and a royal wedding".
Watch a highlights compilation from Kath and Kim below (Video contains some adult humour):