The 28-year-old - who is dating footballer Cristiano Ronaldo - then pulls down her skirt, revealing her almost bare behind.
She continues to seductively pose as she writhes around on the floor of the studio, kicking her long legs up in the air.
The beauty is left wearing just a black leather bra, lace bodysuit and tartan heels at the end of the video.
Irina is the latest in a long line of beauties to put on a racy show for the calendar.
So far the likes of Alessandra Ambrosio, Gigi Hadid, Lily Aldridge, Lindsay Lohan, Miranda Kerr and Pamela Anderson have all been unveiled in the lead up to Christmas Day.
