He was the New Jersey band's bassist from 1983 to 1994.
Musicians Jon Bon Jovi, John Legend, Demi Lovato and Justin Timberlake are also set to join the prime-time virtual celebration.
The actor's daughter with Richie Sambora, Ava Sambora, channeled both of her parents in an outfit she took right from her mother's closet.
An organizer said she was "blown away" when thousands responded to the event, which she'd made for a laugh during coronavirus self-isolation.
You'll get to hear the Duke of Sussex — and the Invictus Games Choir — on the song in March.
The rocker and Duke of Sussex are meeting Friday at Abbey Road Studios.
The institution will also consider Bon Jovi, Nina Simone, LL Cool J and Depeche Mode.