Filmmaker James Cameron, comedian Jerry Seinfeld, hip-hop mogul Jay-Z and disgraced golfer Tiger Woods have all been tipped to become billionaires by 2015 in a new Forbes magazine survey.

The big businessmen have made the respected publication's list of 15 top entrepreneurs who are expected to up their net worths to break into the Forbes 400 - the countdown of the richest people in America.

TV star Seinfeld is thought to be worth $800 million, while Forbes estimates Cameron is worth $650 million and Woods $500 million.

Jay-Z's portfolio of music, clothing and sports investments places him at $450 million.

Others expected to be billionaires in the next five years include movie mogul Jerry Bruckheimer ($850 million), retired basketball icon Michael Jordan ($500 million) and director Tyler Perry ($350 million).

Microsoft boss Bill Gates remains America's richest man with $54 billion in the bank, followed by investor Warren Buffett with $45 billion.

Click for more great Jay-Z pictures: