The Aussie duo also broke out tracks from their recently released second album while on the main stage
As well as delivering orchestral covers of '90s bangers, James also played a DJ set of Britpop classics at a special launch party in London last night (April 3) – check out footage here
Sophie Ellis-Bextor, Natasha Bedingfield, Echo & The Bunnymen and more are also set to play the music bash
The charity initiative will see 700 records auctioned up, each with a different sleeve design by an anonymous artist
Emily Roberts, The Last Dinner Party's guitarist, also joined for the special performance
The event was hosted by Ryan Seacrest alongside Rita Ora, who also performed live
"It's an extraordinary thing to get to my stage in my career and to still be doing things, new excitement"
"Get your disco shoes ready! I’ll be wearing mine"
Other acts announced today include The Last Dinner Party, Sophie Ellis-Bextor, Scouting for Girls, Skindred and The Lottery Winners
It will be the 'Murder On The Dancefloor' singer's biggest ever UK headline tour