Let's get the obvious reference to In Her Shoes out of the way quickly here: In 2004, Cameron Diaz and Toni Collette visited Rittenhouse Square to shoot the film based on Philly author  Jennifer Weiner's bestseller about two sisters.

Now then.

Billie Diaz shopped Saturday at Head Start Shoes off Rittenhouse Square (17th and Sansom Streets), and told owner George Patti that she had to bring her daughter in.

When she returned the next day, Patti realized that Billie's daughter is Cameron Diaz, who picked up a pair of Roberto Del Carlo wedges. And, Patti said, could not have been sweeter.

Mother, daughter and a friend of Billie's had dinner Saturday night at Alma de Cuba (1623 Walnut).

They were in town for GlobalDESIGN, the International Showcase of Exceptional Jewelers, at the Convention Center.