"I've had kisses on my cheeks. I've had hugs," he told a Petronas YouTube video. "A fan gave me a pair of these Japanese boxer shorts, they were so tiny.
"I was [thinking] maybe they're the kids ones or something. And so I thought it'd be funny to try it on but, yeah, I couldn't get them on."
Hamilton's advice for his younger self
One of Oscar Wilde's most famous quotes was: "Youth is wasted on the young."
The insinuation is that it would be better if we could have the wisdom we gain with age when our bodies and minds are at their strongest and most agile.
With that perhaps in mind, Hamilton was also asked what advice he would give if he could speak to himself as a nine-year-old kid.
"I would have just told him all the things my dad probably already told me, just never give up. Keep your head up. Don't take any notice of bullies, don't let them bring you down. Just always keep your head up," he added.