NEW YORK (CNN/Money) - McDonald's has hired Mary-Kate and Ashley Olsen to pitch its Happy Meals in France, complete with the twins' own line of purses, coloring sets and photo albums.

The move to employ the twins, who gained stardom on the television show "Full House" and went on to create a series of children's movies, comes as the world's largest restaurant chain struggles with its European sales.

McDonald's (MCD: Research, Estimates) recently said European same-store sales fell 0.9 percent in August, compared with a 3.9 percent gain in U.S. sales.

McDonald's French site shows the twins and the various branded items, including the "sac en jean Mary-Kate and Ashley."

Mary-Kate Olsen had been receiving treatment for an eating disorder this summer.