Kate Middleton seemingly slipped out a nickname for husband Prince William during a visit to the Chelsea Flower Show in London, according to reports Thursday. The royal couple is facing rumors about trouble in their 5-year marriage.

Australian landscape designer Charlie Albone met the Duke and Duchess of Cambridge at Monday’s flower show. Albone told Australia’s "Today" show that he overheard Middleton calling William by an affectionate nickname at the event, People magazine reported.

“He [William] came up and said: ‘What [flower] is this one?’” Albone said. “And I replied, ‘That’s a Buxus.’ Princess Catherine just turned to him and said, ‘Babe, we've got those. We’ve got loads of those.’”

Kate Middleton and Prince William Kate Middleton and Prince William greet guests attending a garden party at Buckingham Palace in London, May 24, 2016. Photo: Getty Images/AFP/Dan Kitwood

The report comes at a time when the two are rumored to be “heading toward couples therapy” due to various reasons including how to raise their two children — Prince George and Princess Charlotte, according to an InTouch Weekly report. However, Gossip Cop debunked the report saying that Middleton and William were not having any marital issues.

Earlier this month, the Daily Star reported that Middleton wants to have a third baby and is hoping to conceive later this year. The Duchess of Cambridge, who is reported to be traveling to Brazil for the Rio Olympics, does not want to risk the trip due to the prevalence of Zika virus, the paper said.