Naomi admitted to heat magazine: ''Kate introduced me to him at the Olympics. And I said to her, 'Whose son is he? Is he one of our model friends' kids that I just missed out on?' I didn't know who he was.
''Kate was like, 'Stop! No! You must know him.' ''
Despite her own global success, Naomi admits she gets star-struck, but tries to avoid it by keeping her distance from people she admires.
She said: ''Of course I get star-struck, but I don't run up to the person, I just look from afar.
''I saw Michael Douglas' dad Kirk in [restaurant] Cipriani in New York once. He said, 'Come here young lady!' I was like, 'Oh my God!' ''.
And while Naomi had no idea who Harry was, she is a big fan of 'The X Factor' - where One Direction first found fame - and its creator Simon Cowell.
She said: ''I'm a big fan of Simon Cowell. Everything he touches turns to gold and he gives people who have hopes a chance to really make their dream come true.
''I can only watch 'The X Factor' if I'm in the country. I know I can watch it on YouTube, but it's always a few days later and by that time someone's told you what's happened.''
Sia gets a string of Hollywood stars involved in her latest music video, a festive number entitled 'Santa's Coming For Us' from her newly released...
A startling new video has been unveiled by Alt-J to go with their newest single 'Pleader'.
Green Day have long been known for having political undertones in their music, and their new song 'Back In The USA' is no different.
The film is almost half an hour longer than 'The Force Awakens'.
The actress will no doubt be returning for the long-running FX series.
The film is expected to continue without Mendes' involvement.