Luisana, 26, posed for the brand before she became pregnant with her and Michael’s son, who was born just last month.
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In one photo, the Argentinean model wears a leopard print set with black lace trim. In another, she gives the camera a come-hither look in a red satin bra and underwear.
"Luisana's jaw-dropping beauty and effortless charm make her the perfect fit for Ultimo and working with her has been an absolute pleasure from the beginning," Ultimo founder Michelle Mone exclusively told HELLO! Online.
"She takes everything in her stride and brought a unique sense of professionalism and glamour to our AW13 shoot. I couldn’t be happier with the end results – both Luisana and the new collection look amazing,” she added.
The couple welcomed their first child, baby Noah, on Aug. 27, and were quick to share the happy news with fans via Instagram.
"Overjoyed and filled with gratitude at the arrival of our son Noah Bublé," Michael, 38, wrote next to an adorable photograph of his wife cradling the tiny newborn.
Buenos Aires-born Luisana has previously fronted campaigns for L’Oréal and Coca Cola. She's also an award-winning actress in her home country.