Janet Jackson
janet jackson and Wissam al-Mana are believed to have secretly got engaged in December 2012.

Janet Jackson will reportedly walk away with half a billion dollars if she and her fiancé Wissam al-Mana divorce, it has emerged.

The couple, who reportedly got engaged last month, have been dating since 2010 and are planning to tie the knot in a lavish Muslim wedding in Qatar in the spring.

According to reports, 37-year-old Al Mana went against the advice of his lawyers and tore up the pre-nuptial agreement designed to protect his fortune.

The billionaire businessman, who is the managing director of Al Mana Retail, which represents A/X Armani Exchange and  has major shares in Saks Fifth Avenue, instead drew up an agreement that states that Jackson will receive $500m dollars if they stay married for at least five years.

A source close to the I Get So Lonely hit maker said: "Janet will be marrying into the sort of wealth not even her brother Michael managed to amass during his lifetime of success. She's looking forward to a fairytale life with Wissam."

"After two failed marriages, she deserves it."

Jackson was previously married to singer James DeBarge and director René Elizondo Jr. She was also in a in a seven-year relationship with music producer Jermaine Dupri.

The 46-year-old singer has previously insisted that their age difference doesn't matter to her as long as she is happy.

"My mother always raised us to believe that age was just a number. All of us - my sisters, my brothers - we'll just tell you our ages because it's all about where you are mentally and how you feel about yourself. It doesn't matter, "she said.