Russell fancied the hot actress
The lothario comedian met Mila, 29, on the set of 2008 movie Forgetting Sarah Marshall and was keen to get to know her better.
‘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?’ says Russell, 38.
‘Then I go away and she keeps talking about her boyfriend Mac, this is when I was on Sarah Marshall.
‘Eventually she said he’s coming tomorrow and there was some sort of fanfare, she was so excited.
‘Then when he came it wasn’t Mac – it was Macaulay Culkin.’
Mila, who is now loved-up with Ashton Kutcher, dated Mac, 32, for eight years before they split in 2011.
And Russell admits he was shocked by the Home Alone star’s gaunt appearance when he arrived on set.
‘He’d got longer and looked pale and scared of himself, like a shaved horse,’ Katy Perry‘s ex tells the Daily Mirror.
‘There was a horror about him and I thought, “You can’t f*ck him – that’s the lad from Home Alone.”‘