Princess Charlotte's teacher has married one of dad Prince William's closest friends -- and they're expecting their first child
Lucy Lanigan-O'Keeffe and Thomas van Straubenzee
Thomas van Straubenzee and wife Lucy
| Credit: Max Mumby/Indigo/Getty

Princess Charlotte has some happy news to share when she returns to school next month — one of her godparents has married one of the teachers at her school!

Thomas van Straubenzee, a close friend of Prince William and Kate Middleton, married Lucy Lanigan-O’Keeffe in a quiet ceremony in late July.

And the happy news was topped off by the joy that the couple is expecting their first child, PEOPLE has confirmed. The news was first reported by The Sunday Times.

Prince William
Prince William with Prince George, Princess Charlotte and Prince Louis
| Credit: The Duchess of Cambridge

Van Straubenzee, 38, who has known William since they were in prep school together, is a godfather to Charlotte while Lanigan-O'Keeffe, 32, is a senior teacher at Thomas's Battersea school in London — which Prince George, 7, also attends.

Charlotte, 5, was expected to be a bridesmaid when the marriage was originally planned for April. However, the couple had to postpone due to the COVID-19 pandemic and eventually went ahead on July 24 at Chelsea Old Church in London, The Sunday Times said, with only their immediate family present. They are expected to celebrate with their friends at another date.

Lanigan-O’Keeffe is assistant head teacher at the Clapham branch of the Thomas's schools, while also leading mindfulness and outdoor learning at the Battersea school a few miles away.

Can’t get enough of PEOPLE’s Royals coverage? Sign up for our newsletter to get the latest updates on Kate Middleton, Meghan Markle and more!

William's friendship with van Straubenzee is one of his most enduring, and one of many links between the two families. Prince Harry is close with Thomas' brother Charlie, choosing him to be one of his son Archie's godparents, while both van Straubenzees were ushers at Harry's 2018 wedding to Meghan Markle.

The royal brothers are also patrons of a charity set up in the name of the van Straubenzees' brother Henry.