America's top tennis player takes the court at the U.S. Open on Aug. 31. Andy Roddick will now take your questions
The Entourage star's latest film is The Goods: Live Hard, Sell Hard. Jeremy Piven will now take your questions
The most popular man on Twitter plays a Lothario in the new film Spread. Ashton Kutcher will now take your questions
The world's top nuclear watchdog discusses security, the Iraq war and Iran. Mohamed ElBaradei will now take your questions
The Oprah heart surgeon kicks off his own daily TV show this fall. Dr. Mehmet Oz will now take your questions
The producer's latest movie, G-Force, is in theaters now. Jerry Bruckheimer will now take your questions
As the sixth Harry Potter film opens, its star reveals his character's flaws
As the news business struggles, the New York Times's executive editor talks shop. Bill Keller will now take your questions
The Rich Dad, Poor Dad financial guru's new book is Conspiracy of the Rich. Robert Kiyosaki will now take your questions
The WNBA MVP is back on the court after the birth of her first child. Candace Parker will now take your questions
As Do the Right Thing turns 20 this month, its director looks back. Spike Lee will now take your questions
The best-selling author's latest, Finger Lickin' Fifteen, is out June 23. Janet Evanovich will now take your questions