While it looked to be going Robbie's way in the early stages, "Thor" proved he was the king of the land down under and was crowned victor.
Called "Ellen's Australian Boxers", the segment saw the stars buzzing in on giant buttons to answer whacky themed questions.
Robbie, 27, took the honours, quickly coming up with 1981's Physical.
Hemsworth couldn't recognize a wax figure of Liam (points went to Robbie for that one), neither knew where fellow Australian actress Nicole Kidman was born, their Crocodile Dundee impressions were very bad, and they didn't even know the time difference between California and Australia.
"It's supposed to be me".
She chose Liam: "I've worked with him twice'". And "Who would you prefer, Chris or Liam?"
He brought home the win by naming which of DeGeneres's neighbours "may run for president in 2020": Oprah Winfrey.
Robbie - who didn't wear the marsupial suit for the whole show - was also in a sharing mood.
"We walk into the gym and running on a treadmill is Ellen".
The tale begins in Tahiti, where Robbie and her husband Tom Ackerley were honeymooning. So, we get changed to go the gym and Tom puts on these shorts, they're the oldest gym shorts and they're tiny. like, really short, and there's nothing underneath.
Awards season has officially kicked off - and the stars are celebrating!Allison Janney was one of the Golden Globe winners who enjoyed LINDOR milk chocolate truffles while waiting for her trophy to be personalized at HFPA's Official Golden Globes After-Party sponsored by Lindt chocolate on January 7. Babe, you can not wear those shorts. "Who are we going to run into?'"
The "starstruck" pair introduced themselves then everyone joined a stretching class where Ackerley was urged by the trainer to lunge deeper. "And he's dying and I'm crying so much, I'm about to crack a rib".
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. Ackerley decides to wear his "oldest gym shorts", according to Robbie, that were short, pink and very revealing.