Jeff Bezos' fiancee Lauren Sanchez flaunts her VERY toned abs in a

The mom-of-two, 53, shared a clip to her Instagram Stories as she worked up a sweat in the gym with a handful of others - including her husband-to-be.

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Lauren Sanchez, 54, flaunts her sensational bikini body as she lounges in a white, lacy swimsuit while soaking up the sun