The Voice coach Will.i.am has branded the final result of the show and "unexplainable" - adding that he was "perplexed" by the public vote.
Will.i.am, Ed Sheeran and Mumford & Sons are among stars who have recorded versions of famous protest songs to highlight global poverty.
Cheryl Cole said she was "absolutely fine" despite her arm being in a sling after she was injured in a car crash in LA with Will.i.am.
Black Eyed Peas star Will.i.am is creating a new work of art for the Barbican.
The star of The Voice is designing an installation which will explore "the interface between analogue and digital music".
The work will form part of Digital Revolution, an exhibition on the transformation of arts through digital technology, which will feature work by Inception director Christopher Nolan.
Will.i.am said: "Digital Revolution brings together my passions of arts, music and technology. It is an honour to be invited by the Barbican to create a work for the exhibition."
The Voice coach Will.i.am applauded talent show rival Simon Cowell for giving a generation of new stars a platform for their skills.
In an interview for CNBC Meets, Will.i.am said: "If you want to get known put your songs on the SoundCloud and YouTube, or join a talent show.
"I am pleased that there is an outlet for people to go on TV. Thank you Simon for having the programme, thanks for thinking of it because the record company didn't. Thank you.
"So how about applaud Simon for having a platform, instead of putting him down for having a platform."
Singer and producer Will.i.am has praised Prince Harry and for his character and legacy.
The Black Eyed Peas star sat at Prince Harry's table at a fundraising event in New York.
He said: "He's a party prince, a soldier and a philanthropist. He's a regular guy. If Harry was a movie character he would be Iron Man.
"I grew up watching documentaries about the Royal Family so I am really pleased to be meeting him."
Prince Harry has spoken at a New York fundraising dinner in aid of US supporters of Prince Harry's Royal Foundation.
In his speech the Prince said: "Almost a year ago - on the day before the London Olympics - The Royal Foundation launched Coach Core. This flagship initiative seeks to mentor and train our next generation of truly inspirational young sports coaches.
He added: "We now have pilot schemes running in London and Glasgow in Scotland - and I am delighted to announce that funds raised this evening will support a similar programme to be run in partnership with Harlem RBI here in New York, and potentially others like it."
Harry was sat at a table with senior figures from his charity as well as popstar Will.i.am.
Jessie J, Sir Tom Jones, Danny O'Donoghue and Will.i.am will be competing against each other on the BBC talent show, which is set to have some new twists this time round.
The show's ratings dropped during the first series following the end of the "swivel chair" rounds.
An 11-date tour featuring performances from the finalists was cancelled, due to poor ticket sales.
Leanne Mitchell, who was mentored by Sir Tom won the show last year, but a download version of her debut single failed to make it big in the charts.
Black Eyed Peas rapper Will.i.am will debut his latest single Reach For The Stars from the surface of Mars, via Nasa's Curiosity rover today.