Kristin Cavallari debuted her impressive engagement ring after completing a two-hour workout in L.A. Wednesday. The 24-year-old reality star, who accepted NFL player Jay Cutler's proposal over the Easter weekend, "is so excited and completely blind-sided," a source recently told Us Weekly.According to another insider, the couple, who began dating in August 2010 after being set up by Giuliana Rancic, are a match made in heaven."They've only been dating eight months, but by month two, she knew he was The One," the source says.What makes Cavallari's relationship with the 27-year-old Chicago Bears quarterback so strong?
