Mackellar, independent Dr Sophie Scamps: Lime Cordiale, Angus and Julia Stone perform

The two northern beaches bands were part of a star-studded line-up, that also included local band Sons of the East and comedian Dan Ilic.

Climate campaigners Izzy Raj-Seppings and Tim Silverwood were also at the rally.

READ MORE: Liberal Mackellar MP says independent wave lacks transparency

Organisers say around 1000 people, mostly aged 18-35, attended the free event in Dunbar Park on Sunday afternoon.

"This election is critical for everyone, but especially for young Australians," Dr Scamps said.

"The decisions made in our parliament over the next three years will determine the type of future they inherit. Young people want to know that politicians are listening to them and acting in their best interests on the issues that matter and impact their lives."

Oli and Louis Leimbach from Lime Cordiale said they have previously never come out in support of a candidate during an election.

READ MORE: Liberal's Katherine Deves defends her controversial comments

"We've never really got into politics, before cause it's just so contradictory and a little bit icky," Oli said.

"Now there's a big change of independents that are standing for things that we stand for so it really feels like a moment of change."

Comedian Dan Ilic, who emceed the event said: "Integrity, climate action, and empathy - these are things I'm looking for in a life partner, but alas I hear Sophie is taken. She will have my vote, but not my heart," he said.

It's not the first time that Lime Cordiale has thrown their support behind independents this federal election campaign, after they released a hilarious video calling on people to vote for climate change supporters.

READ MORE: Who is on the ballot in the Mackellar and Warringah electorates

Sunday's acts weren't the first celebrities who've come out to support Dr Scamps during her campaign for election in the Mackellar electorate.

She has previously gone surfing with former pro surfer Tom Carroll, and last week Better Homes and Gardens cook/presenter 'Fast' Ed Halmagyi emceed her rally at United Cinema in Avalon.

Have something to say? Send a letter to the editor at: editor@northernbeachesreview.com.au

Our journalists work hard to provide local, up-to-date news to the community. This is how you can access our trusted content: