The leather-trousered lothario who debuted his new stand-up Messiah Complex world tour in London last night, attempted to pull the brunette beauty while filming Forgetting Sarah Marshall and was stunned to discover she was dating "the lad from Home Alone".
According to The Mirror Russ said, "She's so gorgeous, just so gorgeous and I was chatting her up and got the conversation around to have you got a boyfriend, and then you know that feeling of how long do I have to entertain a conversation?"
"Then I go away and she keeps talking about her boyfriend Mac... Eventually she said he's coming tomorrow and there was some sort of fanfare, she was so excited," he added.
"Then when he came it wasn't Mac - it was Macaulay Culkin. He'd got longer and looked pale and scared of himself, like a shaved horse." Ouch!
"There was a horror about him and I thought, 'you can't f**k him – that's the lad from Home Alone." Mila split with Mac, who was once the biggest name in Hollywood commanding £4million per film, after eight years together and is now shacked up with Demi Moore's ex hubby Ashton Kutcher.