Switzerland's Birgit Rausing, with $11 billion in assets, is the world's fifth richest woman.

In 2000, she inherited packaging giant Tetra Laval after the death of her husband, Gad Rausing, who was the son of the company's founder. All of her children sit on Tetra Laval's board. The family's been described as the 'richest of the rich' and the 'most reclusive of the reclusive'.

For years she's featured on Forbes list of the world's 100 richest people. At number 39 in 2009, it appears she's entered the top 50 for good.