Diana Ross -- who was looking va-va-voom at the Kennedy Center last night -- broke her iPhone during the festivities.

So, this morning, she sent her son, Evan of the new "90210," into a local AT&T (at 18th and L Streets NW) store to get it fixed. When he couldn't get results, the diva hopped out of her limo and took care of some business.

See folks, even superstars have to schlep it into the phone store and kick some mobile phone buttocks now and then.