Will.i.am told Britain's Queen Elizabeth II his grandmother had the same dress as her when they met.
The Black Eyes Peas star was introduced to the monarch by Kylie Minogue as part of the royal's Diamond Jubilee celebrations last year.
He was overwhelmed by the meeting and can't believe what he ended up saying.
"I told her I liked her dress and that my grandma has one like it," he laughed to British magazine Heat. "Kylie introduced me to her and it was amazing. Everybody was like, 'Wow, Kylie knows the Queen'."
Will has also met Prince William in the past, with the pair having a giggle about sharing a name.
"Yeah. I told him to stay away from the full stops. I said he had to stick to William. No splitting up the words," the singer laughed. "He's really cool. His wife is really cool, too."
The musician has spent a great deal of time in the UK over the last couple of years as he is a judge on the UK version of talent show The Voice. He has developed a deep love of the country, although he hasn't got involved in all the pastimes there.
"No, I go to [exclusive department stores] Selfridges and Harrods," he replied, when asked if he's ever been to a shop where everything costs 99 pence.
"I used to go to places like that a while ago when no one had camera phones. I do that stuff at home though. I go to the 99-cents store. I have to go right when shops open or when they're just about to close because it's not so busy. Everyone wants to take pictures and I never get any shopping done."
There are other UK customs will has got involved with though. He enjoys drinking cups of tea and has tried battered fish with French fries too.
"I am [a fan of tea], but I try to have honey instead of sugar. I'm hyperactive so the combination of sugar and caffeine will have me spinning off the walls. Even soup makes me hyperactive," he explained.
"Yes, I love [fish and chips]. I have to stay away from all the fried stuff though. I want to keep my boyish figure for when I get older."
- Cover Media