Waist trainers seem to be all the rage these days, and Erica Mena is one sexy model who's totally on board with the fad. Bow Wow's fiancee recently shared a photo on Instagram showing off her new 25" waist, a size she purportedly achieved using her super-tight trainer. Shot in the gym during a workout, the 27-year-old beauty's ample chest and cake are also on display, no doubt to the delight of her many fans everywhere.

Check out the shot up top plus other sexy pics of Erica.