Brand and Kunis worked together in a 2008 film "Forgetting Sarah Marshall" and Kunis was then in a relationship with the "Home Alone" star.
"I was chatting her up, and got the conversation around to, 'Have you got a boyfriend?' and she went, 'Yeah'. So you know that feeling of 'how long do I have to maintain an interest in this conversation now?' It's 12 seconds," thesun.co.uk quoted Russell as saying.
"Eventually, she said, 'My boyfriend's coming tomorrow'. She was excited - and when he came it was not 'Mac', it was Macaulay Culkin," he added.
Brand, 38, was surprised to see Culkin, who was no more a child. He dated Kunis for nine years and ended their relationship in 2011.
"He'd got longer. Like a veal calf, like he'd been grown in a crate. All pale and scared of himself, like a shaved horse," he said.
"There was a horror about him! Macaulay Culkin! The little lad out of 'Home Alone'," he added.
Kunis is currently dating actor Ashton Kutcher.
--IANS (Posted on 20-06-2013)