Madonna paid tribute to Michael Jackson at her tour opener in London this weekend, and today Justin Timberlake, Usher, Mariah Carey and more will pay tribute at the memorial service at the Staples Center today in downtown LA (remind me to stay off the freeways.)

Paul McCartney, Eddie Murphy, Elizabeth Taylor, and Barry Manilow are among the celebrities said to be walking the "black carpet" at the service. According to The Sun, Usher and Justin Timberlake will perform Jackson tributes during the memorial, and Diana Ross -- who Jackson named in his will as guardian of his three children if his mother, Katherine Jackson, was unable to care for them -- will read the King of Pop's eulogy.

According to a statement from Jackson's family, Kobe Bryant, Berry Gordy, Jennifer Hudson, Magic Johnson, Martin Luther King III, John Mayer, Lionel Richie, Smokey Robinson, Rev. Al Sharpton, Brooke Shields, and Stevie Wonder will also participate in the memorial.

According to TMZ, Mariah Carey will perform a tribute rendition of Jackson 5 classic "I'll Be There."

We'll be posting all good performances as they come in.