The funnyman, who plays a politician in new movie The Campaign, was given a chance to grill Gillard during an appearance on Aussie TV show The Project on Tuesday (07Aug12).
However, Ferrell steered clear of heavy political debate and instead asked the country's leader how to deal with a hair disaster.
He asked Gillard, ""I have a question for you. I understand your partner is a hairdresser, is that correct?... I suffer from horrible split ends. Would you have any advice for me? Because this hair's terrible. It's like horse hair and I'm at my wits' end.""
She quipped, ""Will, I can give you some very clear advice... You need to get yourself to a hairdresser straight away; you need to spend buckets and buckets of money on in-salon treatments and you need to buy everything that they recommend for you to take home.""
When Ferrell attempted to introduce a more topical subject by asking about electricity prices, Gillard shot back, ""Will... I'm concerned with all these treatments in the hairdressers - there's a lot of power being used with blow dryers and the like, so these power price issues are important for you, too.""