The Duke and Duchess of Cambridge are celebrating four years of marriage after the spectacular royal wedding on April 29, 2011.
William and Kate are obviously busy with royal baby stuff so while we wait for the next photo of them, which will inevitably be alongside their second child, here are 12 pictures showing their story so far.
After meeting at the University of St Andrews in 2001, Kate Middleton and Prince William were photographed separately as they left their graduation ceremony on June 23, 2005.
However ahead of the royal wedding in 2011, the Middleton family released this photo of them celebrating after the ceremony.
Kate and William were photographed together during university and she attended his 21st birthday party at Windsor Castle in June 2003, however it was not until March 2004 that their romance was exposed.
The pair were pictured kissing for the first time in 2006 and they were photographed at the Six Nations rugby tournament in February 2007.
However in April 2007, they broke up. A photo taken at a memorial concert for Princess Diana at Wembley showed them sitting apart in June 2007.
It was only a few months before the couple rekindled their romance and this photo taken at RAF Cranwell when Prince William received his RAF Wings shows them looking happier than ever.
And the news every royal fan had been waiting for came in November 2010 when Prince William popped the question.
The royal wedding took place in April 2011.
And one of their many royal tours was the Diamond Jubilee tour of the Far East in 2012.
In December, Kate’s pregnancy was revealed early when she was admitted to hospital with acute morning sickness.
And Prince George arrived in July 2013.
When they went on tour Down Under to Australia and New Zealand in 2014, Prince George, now a toddler, was in tow.
But they left him at home when they went to US in December last year after announcing in September that Kate was pregnant with their second child.
And here is one of the last pictures of the Duchess and Duke together before she went on maternity leave.
The next time Kate and William are seen together, another tiny royal is likely to be in the photo.