Back in May, it was confirmed that heartthrobs One Direction would play a date at this year's iTunes Festival and now the lads have revealed who will be supporting them.

The 'One Thing' hitmakers are set to rock the Roundhouse in Camden on September 20 and member Niall Horan took to social networking site Twitter earlier this afternoon (August 21) to let the group's fans know who else will be joining them:

"Guys excited to say that @thisisangel will be supporting us at iTunes festival. Gonna be a sick night!"

Angel then tweeted about his addition to the bill, writing: "Guys I'll be doin #iTunesFest with @NiallOfficial & @OneDirection. All my new followers check out my song #Wonderful."

One Direction also excited their followers today by promising to reveal some "cool news" very soon and by sharing a new promotional clip teasing their forthcoming performance at the MTV VMAs.