Katharine McPhee's net worth was earned through her ... just a decade after competing on a televised singing show, she would be a multi-millionaire. And as the years progress, that fortune only ...

The record producer serves as Katharine's mentor on the singing competition, which kickstarts several musical collaborations and chance run-ins at celebrity events over the next several years.

the American Idol alum teased that Foster and his wife Katharine McPhee might sing at her wedding later this month. "Well, there might be a very special performer performing at my ceremony ...