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15 celeb entrepreneurs who parlayed fame into fortune

The Honest Co. founder and Chief Product Officer Christopher Gavigan (left) and founder Jessica Alba attend the company's launch at the Westwood Target in Los Angeles.

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Jessica Alba, The Honest Co.

An allergic reaction to a laundry detergent spurred the actress to create a company that offered truly nontoxic options, but it took a while to get people to take her seriously. "It took three years of people not getting it," Alba said at the recent SXSW conference. "It was too big of an idea." She finally convinced Brian Lee of LegalZoom to work with her, and the company launched in 2011. It tripled its revenues to $150 million in 2014 and is now valued at nearly $1 billion.

Stefanie Keenan | Getty Images