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Margot Robbie and Chris Hemsworth went head to head to find out who the best Aussie is in a game of "Ellen's Australian Boxers".

'I am going to ask you some Australian-based questions and you buzz in if you know the answer, ' Ellen explained.

The answer to that question is, in fact, Ellen DeGeneres, her wife Portia de Rossi, and Barack Obama - a trio who all happened to be vacationing, separately, at the same private Tahitian luxury hotel and working on their fitness together in its teeny gym at the same time.

Questions included naming an Olivia Newton-John song, to the birthplace of Nicole Kidman and who could do the best Crocodile Dundee impression. And "Who would you prefer, Chris or Liam?" Tom chose to wear his oldest, smallest shorts to work out in because, as Margot explains his thinking was, "Who are we going to run into?"

Let's all spare a thought for Margot Robbie's husband, Tom Ackerley, shall we?

Robbie and husband Tom Ackerley at the Golden Globes in Los Angeles on January 7.

All three were on treadmills at the gym.

Robbie is now promoting her upcoming film, I, Tonya, which earnt her a Golden Globe nomination for Best Actress - Motion Picture Comedy or Musical for the leading role of Tonya Harding.

The "starstruck" pair introduced themselves then everyone joined a stretching class where Ackerley was urged by the trainer to lunge deeper.

TWO of our most famous acting exports have taken each other on in a battle to be crowned the best Aussie on The Ellen Show.

"He's dying and I'm crying so much I'm about to crack a rib", said Robbie.