Photo credit: PNP
Next Mackenzie Aladjem Slideshow: Variety's 5th Annual Power of Youth Event held at Paramount Studios - Los Angeles, California - Saturday 22nd October 2011
The singer introduced "the next generation" in Iceland.
Jack Antonoff hears a ''female voice'' in his head when he writes music.
The show will be seen by everybody at the same time.
The Scottish comedian has been speaking about gaining a knighthood in the Queen's Birthday Honours List.