The new couple have been making the most of their time together after Cooper, 40, recently finished his acclaimed London run of his film "The Elephant Man", reported Daily Mirror.
They met in May just as both had split from long-term loves - Cooper with model Suki Waterhouse, 23, and Irina with soccer ace Ronaldo, 30.
The 29-year-old Sports Illustrated cover girl looked happy in the arms of "Hangover" star.