Paris Hilton can't take her eyes off her new BFF ... and we're not talking about her fiance Chris Zylka.
Paris had a laser lock on the giant 20-carat, $2 million engagement ring Tuesday as the couple took a romantic stroll around Aspen.
Not on accident -- of this we're sure -- Paris was wearing fingerless gloves, but no glove could hope to contain that gem.
As we reported, Zylka popped the question mid-mountain over New Year's weekend -- and he's probably been competing with the rock for Paris' attention ever since.
They really are a girl's best friend. A really big best friend.