JAY Z COAST TO COAST

It's 5:15 am on Saturday. This is a time when if you're a hip-hop star and one of the biggest celebrities in the world, you may be heading home from an exclusive private club or an after-hours A-list party. This is not the time when you start preparing for a concert. But at this ungodly hour, Jay-Z is preparing for the first in a series of concerts around the country — in one day.The recently unretired rapper, whose comeback album "Kingdom Come" will be released on Tuesday, is celebrating his return to the game with a seemingly impossible trek to major cities for 30-minute concerts. The first stop is Atlanta, where Hova was scheduled to give a concert at 6 a.m., when most people haven't eaten their breakfast. The last stop is Las Vegas at 3 a.m. Sunday.Jay-Z Documentary at UN In a new documentary, Jay-Z is reminded of his early life in the Brooklyn projects as he sees children playing near open sewers in an Angolan slum."In my business, we like to say we're from the hood," said the 36-year-old rap superstar, settling in a car to leave the shantytown. "We're not in the hood. By no means. Not even close.""The Diary of Jay-Z: Water for Life" was shown Thursday evening at U.N. headquarters. It airs Nov. 24 on MTV.The film is part of the rapper's partnership with the United Nations and MTV to get young people involved in the world's water crisis.