According to Mail Online, sources have claimed Welsh opera singer Katherine will walk down the aisle at Hampton Court in London on Saturday, 27 September.
The insider added that the couple are hoping to keep the wedding details private for now.
If true, the wedding will come just five months after American film director Andrew popped the question to Katherine during a holiday to The Hamptons in New York.
In July, singer Katherine said no wedding date had been set but she was in wedding planning mode. "I'm very, very happy," she said at the time.
The couple's families have already met and get on great, she added, meaning there's no worry of tensions on the big day.
"I knew that they would all hit it off, they are very similar people and family is important to both groups so it's great. It's really lovely," she told ITV's Good Morning Britain.
Katherine hasn't been shy about showing off her incredible engagement ring, including this past June when she proudly supported Andrew at a screening of his directorial debut Lullaby in New York.
Andrew, meanwhile, has also publicly supported his wife-to-be, accompanying her to Buckingham Palace earlier this year where she collected an OBE.
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