Prince William has told a trainee midwife he may see her "sooner" than she thinks.

Prince William

Prince William

The 35-year-old royal is expecting his third child with his wife Catherine, Duchess of Cambridge, and during a visit to Spitalfields Crypt Trust earlier this week - where he met with recovering addicts to discuss the legalisation of drugs - he spoke to a trainee midwife, who he claimed may see him again in the near future.

He told her: "All the best with the midwifery, I may see you sooner than you think."

His comments come after he previously admitted it was time to start "celebrating" the pregnancy, after claiming he wouldn't do so until Catherine, also 35, had pushed past her bout of Hyperemesis Gravidarum, the severe morning sickness she also suffered with her first two pregnancies.

Prince William - who has four-year-old Prince George and two-year-old Princess Charlotte with his spouse - said: "I was a bit anxious to start with, but [we can] start celebrating this week."

William's comments seemingly confirmed the third royal baby is due in March, as although he didn't confirm the due date, people tend not to celebrate their pregnancy until they hit the three-month mark as there is less chance of miscarriage, and it's usually when parents are able to see their baby properly on a scan.

The couple - who got married in 2011 - announced their pregnancy in a statement.

It said: "Their Royal Highnesses The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting their third child. The Queen and members of both families are delighted with the news.

"As with her previous two pregnancies, The Duchess is suffering from Hyperemesis Gravidarum. Her Royal Highness will no longer carry out her planned engagement at the Hornsey Road Children's Centre in London today.

"The Duchess is being cared for at Kensington Palace."