Other Vanguard Award honorees include Cher, Britney Spears
The group also tackled Lady Gaga's 'Telephone'
Ellen DeGeneres, Neil Patrick Harris, Gus Kenworthy and more
Soul legend transcended erratic chart stats, uneven musical output
the model has boycotted the festival over the owner's anti-LGBT donations
the actress teased the collab last month
the actress says details will be revealed on Sept. 6
