Speaking about her breakup with 'Home Alone' actor Macaulay Culkin, Mila Kunis said, "It was a horrible...breakup. I f**ked up." "I was an a**h*** in my 20s...I'll be the first to admit it," she added. Mila further said, "When I got to be single I said, 'I genuinely need to know why I did what I did.'"