Singer Michelle Williams, Black Eyed Peas’ Taboo and choreographer Brian Friedman will make up the panel of judges on “MTV’s Top Pop Group.”

The competition series, which is hosted by Mario Lopez, premieres Sept. 11.

Celebrity mentors will be announced at a later date.

Viewers can learn more about the nine competing music groups at TopPop.MTV.com. Last night’s casting special also is available on-demand at the Web site.