ET has exclusive details behind the list of celebrity performers who will participate in the public memorial service for the late Michael Jackson to be held at the Staples Center on Tuesday, July 7.

ET has learned that both Smokey Robinson and Berry Gordy will speak at the memorial service, although Robinson will not be singing.

Jennifer Hudson is set to perform with the Andrae Crouch Choir -- and ET has learned that an invitation was extended to Alicia Keys to perform, but the singer's attendance has not been confirmed.

ET has confirmed that Natalie Cole will also be attending Jackson's public memorial service. A rep for the star tells ET that Cole is recovering "wonderfully" from a kidney transplant procedure she recently underwent. At the request of her doctor, the star may be wearing a mask and gloves Tuesday as a preventative measure to avoid infection.

A rep for the Jackson family tells ET the following will also be participating in the memorial service:

Ron Boyd (family friend); Kobe Bryant; Mariah Carey; Shaheen Jafargholi (finalist on "Britain's Got Talent"); Magic Johnson; Martin Luther King III; Bernice A. King; John Mayer; Lionel Richie; Rev. Al Sharpton; Brooke Shields; Pastor Lucious Smith (family friend); and Usher.

Keep checking ETonline for further coverage of the memorial service.