Credit: Courtesy of TAG Heuer

She's donned incredible jewels on the red carpet over the years, but these days Cameron Diaz's favorite accessory is a watch.

The 39-year-old actress is the new face of Tag Heuer's Link Lady collection, and she shows off a sleek, steel style in her first ad for the brand.

"The Link Lady is modern, sexy and elegant and I'm equally comfortable wearing it on the red carpet or in my day-to-day life," she said in a statement. "The first watch I bought was a Tag Heuer at 18," she added.

In addition to lending her gorgeous face to the campaign, her three-year partnership with Tag Heuer will also help raise awareness for UN Women, the United Nations Entity for Gender Equality and the Empowerment of Women.