More details have been leaking in about Michael Jackson’s memorial service, which is set to take place at the L.A. Staples Center tomorrow.

Yesterday we confirmed that Jennifer Hudson would be performing at the event. Now, reports are saying that Stevie Wonder, Diana Ross, Justin Timberlake, Mariah Carey, and Usher will also make appearances. According to festival organizers, there will be a few surprise performers, someone will be performing Man in the Mirror, and Mariah Carey will sing “I’ll Be There”. The all-star line-up will come together at the end of the show to perform Michael’s 1992 hit, Heal the World.

The service will be broadcast on NBC, ABC, CNN, MSNBC, and E!.

Update: Here is the confirmed list of celebrities who will be making appearances at the event: Kobe Bryant; Mariah Carey; Andrae Crouch Choir; Berry Gordy; Jennifer Hudson; Shaheen Jafargholi (finalist on Britain’s Got Talent); Magic Johnson; Martin Luther King III; Bernice A. King; John Mayer; Lionel Richie; Smokey Robinson; Rev. Al Sharpton; Brooke Shields; Pastor Lucious Smith (family friend); Usher; and Stevie Wonder.