James Devaney / WireImage 1 / 15
James Devaney / WireImage 1 / 15

TV star Padma Lakshmi is in mourning after the death of her longtime partner and business financier, Theodore Forstmann.

RELATED: Gone To Soon

Forstmann, who had been dating the "Top Chef" host for the last several years, passed away on Sunday after a battle with brain cancer. He was 71.

RELATED: 2011 Emmy Awards

Forstmann founded the investment firm Forstmann & Little Co. in 1978, and the organization went on to acquire a number of different companies, including beverage group Dr. Pepper and sports agency IMG.

RELATED: Padma Lakshmi Chats About Diaper Disasters & More

The billionaire, who was also briefly linked to the late Princess Diana during the late 1990s, vowed to give half his net worth to charity following his death after partnering with The Giving Pledge in February.