Russell Brand tired to flirt with Mila Kunis while filming 'Forgetting Sarah Marshall' in 2008 but she rebuffed his advances as she was with 'Home Alone' star Macaulay Culkin at the time.The 38-year-old comedian attempted to flirt with the brunette beauty when they were filming the romantic comedy 'Forgetting Sarah Marshall' in 2008 but she wasn't interested in his advances because she was dating Macaulay Culkin at the time.He is quoted by the Daily Mirror newspaper as saying: "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, this is when I was on 'Forgetting Sarah Marshall'."Russell was mortified when he realised Mila - who has been voted the Sexiest Women in the World by various men's magazine - was in a relationship with Macaulay, who shot to fame as a child star in 'Home Alone'.He added: "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. He'd got longer and looked pale and scared of himself, like a shaved horse."There was a horror about him and I thought,, 'You can't f**k him - that's the lad from 'Home Alone'!"Mila was with Macaulay for eight years before she dumped him in 2011, she is now in a relationship with Ashton Kutcher.Russell split from Katy Perry in December 2011 just 14 months after they tied the knot in India and their divorce was finalised in July 2012.