Luann de Lesseps, 57, models a skimpy bikini alongside her daughter Victoria, 28, while in Mexico

Luann de Lesseps posts two sizzling snapshots in a blue bikini in Mexico

Luann de Lesseps shows off her incredible physique in a TINY blue bikini on the beach in Mexico

Luann de Lesseps, 57, looks in top shape while modeling a black bikini on the beach in Mexico