The couple who started dating last April (15) posed for pictures for the first time at the Paris Fashion Week event.
Irina, one of the cosmetic brand's spokesmodels, wore the colour red, to celebrate the launch of new colour Riche La Palette and L'Oreal Paris's partnership with the city's fashion week.
Just the day before, Irina walked in the Givenchy runway show with Bradley sat in the front row next to Vogue editor Anna Wintour.
Bradley's very public show of support came days after he was pictured going to a restaurant with model Naomi Campbell.
"When Irina walked down the runway, everyone in the room looked at Bradley's expression first while he was seen following her with his eyes every second of the way down the runway," a source told E! News.
"After the show, Bradley gave Irina a kiss and hug and told her what a great job she did."
Models Karlie Kloss, and Lara Stone, who wore a striking red PVC jacket and trousers mingled with Chris Brown and Formula 1 champion Lewis Hamilton at the L'Oreal event.