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Kristin Cavallari was spotted leaving M Cafe on Melrose today, and the former Hills hottie showed off her glowing skin -- and that fabulous 5.2 carat rock! -- when we snapped her picture.

While Kristin seems thrilled that her engagement to NFL star Jay Cutler is back on, we're sad to report that she won't be spending her whole holiday vacation with her beau. "I won't be with him Christmas Eve or Christmas, but I'll be with my mom and that whole side of my family," Kristin told Us Weekly on Monday. "Jay, unfortunately, is playing in Green Bay on Christmas Day." Boo! This is the first holiday that the couple has spent apart, "so obviously it won't be great," she added. "But it is what it is."

But hey, there's still New Year's Eve, right? Hopefully these two get to stand under the mistletoe for that one!