Hugh Jackman has branded new mother Cate Blanchett a "superwoman" for committing herself to a two-day Australian conference - just six days after giving birth to her third child.

The X-Men star was in attendance at Saturday’s Australia 2020 summit - where he encouraged native Australian actors working abroad to return home for projects - and was stunned to see the 38-year-old arrive at Parliament House in Canberra with her newborn son in tow.

The actress, who welcomed Ignatius Martin Upton last week, handed the child to her playwright husband Andrew Upton, and proceeded to take her place among 1,000 fellow delegates to help moderate a debate during the arts segment of the talkfest.

Jackman, 39, says, "Cate Blanchett is superwoman. She is amazing on every level. I think she is flawless as a person."