Despite uncensored shots of their infamous hot tub tryst in the middle of Mexico leaking to the Net late last week, spywitness spotted former ‘Newlywed’ Nick Lachey shopping for a diamond engagment ring at Cartier’s Seattle.

According to National Enquirer celebrity tattle Mike Walker: “Two items fascinated Nick: A platinum band with a solitaire princess-cut diamond called “Declaration”, and a 5-carat emerald-cut stone set off by baguette diamonds. Nick told the salesgirl he wasn’t ready to buy “just yet - but I think I’ve narrowed it down to two.”