What's her secret? Cate Blanchett, 47, looks ageless and elegant on The Tonight Show in NYC

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She's the acclaimed Aussie actress, who's using her star power for good.

And Cate Blanchett, 47, looked every inch the Hollywood star during an appearance on The Tonight Show Starring Jimmy Fallon on Monday.

The Thor actress looked as youthful as ever as she exchanged laughs with the American TV host.

Radiant: Cate Blanchett, 47, looked every inch the Hollywood star during an appearance on The Tonight Show Starring Jimmy Fallon on Monday

Sporting a crisp white blazer atop an elegant black blouse, the mother-of-four looked effortlessly chic as she arrived on set.

She paired the look with loose-fitting trousers and pointed-toe heels, which gave her an overall smart yet glamorous appearance. 

Cate's cropped blonde locks were worn loosely and neatly parted at the side and she opted for elegant makeup - consisting of foundation, smokey eyes and a nude lip.

Glowing: The Melbourne-native, who is currently starring in Broadway's The Present, is often hailed for her natural good looks

LOL: The Thor actress looked as youthful as ever as she exchanged laughs with the American TV host

All natural! In 2012, the genetically-blessed star said she is 'too frightened' to undergo plastic surgery, despite the pressures in Hollywood

The Melbourne-native, who is currently starring in Broadway's The Present, is often hailed for her natural good looks. 

In 2012, the genetically-blessed star said she is 'too frightened' to undergo plastic surgery, despite the pressures in Hollywood. 

'I just know what works for me, I'd be too frightened about what it means long-term,' she told Fashion ETC.

Natural beauty: 'I just know what works for me, I'd be too frightened about what it means long-term,' she told Fashion ETC. 'Looking at women in their 20s doing this stuff, in the end all you see is the work. It doesn't fill me with admiration; it fills me with pity'

'Looking at women in their 20s doing this stuff, in the end all you see is the work. It doesn't fill me with admiration; it fills me with pity.'

The following year, she reportedly signed a $10 million beauty contract with Georgio Armani and was the face of Japanese skincare brand SK-II.

Last week, Cate participated in New York's Ghostlight Project march, a movement dedicated to highlighting inclusion and compassion for everyone regardless of differences.

Using her star for good: Cate joined The Ghostlight Project's protest march for equality in New York City last week

Family affair: Cate was joined by her family including young daughter as she braved the cold conditions at the protest

Having fun: The 47-year-old smiled and laughed with her young daughter who appeared in a cheeky mood, stealing her mother's beanie from off the top of her head

It's not the first time that the Oscar-winning actress has lent herself to a cause.

In May last year, Cate was named a United Nations Goodwill Ambassador, visiting Syrian refugee families in Jordan on behalf of the global organisation.

The striking beauty told UNHCR she felt compelled to take on the role because she was a mother.

Working for change: It's not the first time that the Oscar-winning actress has lent herself to a cause

Helping refugees: In May last year, Cate was named a United Nations Goodwill Ambassador

On the ground: Cate visited Syrian refugee families in Jordan on behalf of the global organisation

'There has never been a more crucial time to stand with refugees and show solidarity,' Cate said.

'... It feels like we're at a fork in the road, do we go down the compassionate path or do we go down the path of intolerance?'

In Australia, Cate has also been an outspoken advocate for more action on climate change, boldly fronting a carbon tax media campaign in 2011.

Closer to home: In Australia, Cate has also been an outspoken advocate for more action on climate change (Pictured in 2010 as work began installing solar panels on the Sydney Theatre Company building)

She joined a Sydney march of 20,000 in 2006, calling on the Australian government to do more on climate change.

While promoting her movie Blue Jasmine in 2013, the actress spoke of the importance of equality for women.

'I feel that all of the steps forward that we've made ... a lot of those have been rescinded,' she told Sky News.

'Conservatism is affecting the way women perceive who they are in the world.'

Raise your voice: In 2007 she helped launch a new web-based campaign, whoonearthcares.com, which allowed people to express their concerns about climate change