Royal baby countdown: Where's Meghan? Harry steps out with Kate instead

Prince Harry and Kate Middleton attended the Anzac Day Service of Commemoration and Thanksgiving at Westminster Abbey, in London. Photo / Getty Images

Prince Harry has joined his sister-in-law Kate Middleton at an Anzac Day ceremony, as the world eagerly awaits the imminent arrival of he and his wife Meghan Markle's first child.

The Duke of Sussex's royal calendar was cleared in anticipation of Baby Sussex's arrival, but he attended the afternoon service at Westminster Abbey with the Duchess of Cambridge and the Duke of Gloucester.

Prince Harry and the Duchess of Cambridge were pictured laughing and smiling with each other before they were greeted by the Dean of Westminster, Dr John Hall outside the Abbey.

Harry, wearing his medals, and Kate were all smiles. Photo / Getty Images

He was dressed in a black suit with medals pinned to his chest while his sister-in-law wore a teal Catherine Walker coat with matching headpiece and dark green heels.

The pair's appearance appears to fend off rumours of a rift between the two couples.

Harry looked relaxed despite the impending arrival of his first child. Photo / Getty Images

Tensions have been rising since Prince William reportedly "riled" Harry for voicing concerns over his younger brother's whirlwind relationship with Markle.

It has also been reported the Duchess of Sussex and the Duchess of Cambridge clashed months ago - with the Duchess of Cambridge reportedly brought to tears during the Sussex's wedding preparations.

Prince William attended an Anzac Day service in Auckland with PM Jacinda Ardern during a short tour of New Zealand before meeting with a five-year-old victim of Christchurch terror attack and first responders.

Kate looked delightful in a teal coat dress. Photo / Getty Images

Before the service, Prince Harry was seen speaking with the High Commissioner of Australia, George Brandis, who had attended a dawn service in Hyde Park and wreath laying ceremony in Whitehall earlier in the day.

The victims of the Christchurch terror attacks were mourned at the solemn Westminster service as the Dean prayed for an "end to terror and for the triumph of peace" and honoured the "bravery and determination of the men at Gallipoli".

The Duchess of Sussex's pregnancy was announced in October and she is expected to give birth in late April or early May.

She hasn't been seen in public since March 11 when she attended a Commonwealth Day service with Prince Harry at Westminster Abbey.

Details of the birth have been kept private at the request of the couple, but Buckingham Palace is expected to make an announcement when the Duchess of Sussex goes into labour.

Meghan is due to give birth any day now. Photo / Getty Images