Are there any big artists that play other artist's signature model instruments as their main axe?

I have not seen any. I saw someone playing a
Fender Geddy Lee on TV, I think it was with David Bowie ? and there used to be a guy named Tony
Montana (total stage name) in the Band Great White
that played a Yamaha Limited Attitude,(Billy Sheehan style).:)

Stefan Lessard -(Dave Matthews) and David Eleffson (sp?)- Iron Maiden both play Flea basses, correct?:)

Simon Gallup (The Cure) plays a Jack Casady sig. Epiphone.
(I think the current Incubus bassist plays one too)

I saw lots and lots of people with play gibson Les Paul.
As for bassist goes, I don't really have an idea.