Jessica Simpson has signed on as spokeswoman for Stampede Light Plus, made by Dallas' Stampede Brewing Co.
Simpson will appear in ads in stores for the beer and is taking a 15 percent stake in the brewer.
The Dallas Morning News says terms were not disclosed.
Lawrence Schwartz, Stampede's president and chief executive, says Simpson is the now face of the brand.
Simpson said in a statement that as an entrepreneur she's "always looking for ways to diversify my portfolio with good ideas and good people."
Stampede Light bills itself as a beer for active people.