'She Looks So Perfect' heartthrobs 5 Seconds Of Summer have revealed that they will be making a 'huge announcement' tomorrow (July 22) that will be of interest to their fans in the USA. 

Writing on their collective Twitter page last night, the stars explained that they will share the news live on Ryan Seacrest's radio show and they can't wait to reveal all:

"HI USA! we’re gonna be on @OnAirWithRyan with @RyanSeacrest on Tuesday :) we have a big announcement to make! x"

The boys have also confirmed a headlining slot at this year's iTunes Festival in the UK and will perform at Camden's Roundhouse on September 4. Other acts confirmed for the month-long event include Pharrell Williams, Maroon 5, and Kylie Minogue. 

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Listen to 5SOS performing a cover of Katy Perry's 'Teenage Dream' below: