Uh, Mayor? It's "Ellen"

Ellen DeGeneres taped her talk show here yesterday, and Mayor Daley continued to make Chicagoans proud when -- despite her name in gigantic letters behind him -- he introduced her to the crowd as "Helen" DeGeneres. And Ellen didn't just let it slide:

"The city has a whole transportation system named after me. 'El.' 'Ellen,'" DeGeneres told the mayor before a seated audience of about 1,300 folks.

To make matters worse, her schlockmeister guest Robin Williams got in a dig as well:

"My name is Reuben here," [Williams] said upon joining her on stage.

The show featuring Daley's gaffe will air on Tuesday. [S-T]