Robbie Williams has experienced a string of pregnancy symptoms including morning sickness and backache.
The 'Angels' hitmaker's wife Ayda Field is due to give birth to their first child, a daughter, next month and he claims he has suffered from weight gain and other side effects during her first trimester in sympathy of his spouse.
In an interview with Italian Vogue magazine, he said: "I got fat. Isn't it incredible? She has to eat for two, but I've gained her weight. It must be the empathy. I read about it and it says that sometimes husbands suffer same effects during the pregnancy as their wife."
Asked if he has also experienced nausea and backache, he added: "Yes, yes, everything. If she was sick, I was. If she had bad mood, me too. This happened during the first three months."
While Robbie is "scared" about becoming a parent, he can't wait to bond with his daughter.
He admitted: "Right now I'm scared, but I want to build a relationship with her, I want to be there for her, I want to love her, I want it."
And though the 38-year-old pop star is happily married, he admits Ayda is not as kind to him now as she was when they first started dating.
He said: "[In the beginning she would say] how stylish I was, she always congratulated me for how I dressed.
"Now she criticises me. She asks me why I am wearing that sweater instead of the other one.
"The first year everything is perfect, forgiven and wonderful, but the pain comes after."