Gaga & Irina's Fight Night - The Battle For Bradley

The co-stars get cosy as the world watches

Lady Gaga and Bradley Cooper’s electric performance of their Oscar-winning song “Shallow” was one of the highlights of the Academy Awards, but there was one person who wasn’t so spellbound by their obvious chemistry – his girlfriend Irina Shayk!

“Irina was furious with Bradley and made her feelings abundantly clear as soon as he sat back down afterwards,” reports a witness. “There was obvious tension between them and as they were walking out, they had a huge fight. Brad’s mother tried to mediate, but Irina stormed off in tears.”

Neither the Russian supermodel, 33, nor the American Sniper actor, 44, attended that night’s Vanity Fair after-party – unusual for such a high-profile nominee – although newly single Gaga, 32, was one of the belles of the ball, sparkling in a 129carat diamond necklace last worn by Audrey Hepburn.

After rumours of an affair between the A Star Is Born co-stars hit fever pitch on the eve of the Oscars – when the “Judas” singer dumped fiancé Christian Carino, 50 – Irina made a point of sitting in between Gaga and Bradley at the ceremony.