"Extra" reveals Kate Gosselin's ex-fiance -- who never said "I do" to the reality mom! Did her cheating blow-up her first engagement?

Then, John Stamos dishes about Denise Richards raving about their prior bedroom activities!

Plus Denzel Washington, raw! The "Pelham 123" star answers your fancam questions -- and why he's telling an "Extra" friend to write him a letter!