The longtime lovebirds were joined by Vladimir Doronin and supermodel Naomi Campbell as they feted the founder and president of de Grisogono jewelry on his 58th birthday.
While rumours abound of an upcoming engagement, ladies man Leo looked happy and smitten with his swimsuit model gal pal as they cozied up in a private area of the establishment.
Meanwhile, funnyman Will Farrell stole the box office crown from Leo over the weekend as his new cop comedy The Other Guys sold about $35.6 million worth of tickets.
Leo’s dreams thriller Inception — which has been at No. 1 for the past three weeks — slipped to No. 2 with $18.6 million.