The 'Silver Linings Playbook' actor has been spotted several times with the model in recent weeks and though they haven't officially confirmed they are a couple in public, in private they're getting serious.A source told the new issue of Grazia magazine: "Bradley's smitten and has been for a few weeks."He adores Irina and was raving about her to friends Sienna Miller and Madonna at the Met Gala."They were careful not to go on the red carpet together but, while they arrived and left separately, they were officially one another's date."The couple were introduced by mutual friend Leonardo DiCaprio shortly after Bradley split from British model Suki Waterhouse.The source said: "Bradley was very taken with Irina when he first saw her at the Oscars in February. He and Suki were on the rocks and, once they'd split, Leonardo introduced him to Irina."News of Bradley's relationship came as a shock to Suki, who had enjoyed a brief reunion with the 'American Sniper' star after they split in March due to their age gap and the pressures of work.The source said: "Suki was disappointed by how quickly their reunion fizzled out but it was inevitable, because the same problems were still there."She was, however, a little surprised at how quickly Bradley has moved on with Irina."