The four-times Oscar nominated star reportedly split with Irina after they clashed during their recent holiday.
The paper also reports an unnamed source who blames the rift on Irina not getting on with Bradley’s beloved mum Gloria.
“Irina thought things were going brilliantly with Bradley and is very upset they ended this way,” says a close friend.
“They spent Christmas together in LA but arguments started, mainly centering around the fact Irina and Bradley’s mum weren’t getting on very well.
“Bradley’s mum and Irina were quite close at the start of last year but the more time they spent together the more they realised that they didn’t get on.”
“Irina is a very strong, beautiful Russian woman who knows what she wants, and perhaps Bradley’s mum saw that as something she didn’t want for her son.”
The Hangover star is so close to his mum Gloria, he actually lives with her in Hollywood.
He admitted they “needed each other” following the “brutal” 2011 death of his father from lung cancer.
“But don’t get me wrong,” he said in 2013. “It’s not without complications. It’s not like I live in a compound and she’s in the guesthouse. No. She’s in the next room.
“But here’s the thing: She’s a cool chick. We can hang, and she can roll with the punches.
“If that wasn’t the case, there’s no way.”
Irina and Bradley started seeing each other in April 2015 and were spotted on a string of theatre dates in New York.
In September they holidayed with Bradley’s mother in Atlantic City, New Jersey.
They were last seen together on Christmas Eve heading for dinner at Nobu restaurant in Malibu.
The couple’s break up comes exactly a year after Irina split with footballer Cristiano Ronaldo after five years together.
Irina is now reportedly seeking solace in the arms of British model Stephen James, who comforted her on her recent 30th birthday.
Bradley is one of Hollywood’s most notorious womanisers, having dated a long list of A-list starlets.
Following the end of his two-year marriage to Crash actor Jennifer Esposito in 2007, he has been alleged to have romanced Cameron Diaz, Denise Richards, Olivia Wilde, Jennifer Lopez and Melanie Laurent.
He was engaged to Renee Zellwegger in 2011 and dated Avatar actor Zoe Saldana shortly afterwards for a year.
Before meeting Irina, he was in a year-long relationship with British model Suki Waterhouse, who is 17 years his junior.