The Tonight Showdown -- Prince Zings Letterman

5/29/2009 12:30 PM PDT BY TMZ STAFF
After playing a three night gig for Jay Leno and performing on his penultimate show, it's pretty obvious where Prince's late night loyalty lies -- but in case you're still not sure, this hand-written sign should drive the point home.

Prince & Leno: Click to watch
"Jay is the best. Even Paul Shafer [sic] knows."