Prince Andrew is seen smiling with Anne and Sarah Ferguson at St George's Chapel - as his brother the King also attends Easter service amid cancer treatment

Prince Andrew beamed today as he walked in front and centre alongside senior royals to attend the Easter Sunday Service at Windsor.

The Duke of York strolled into St George's Chapel alongside his ex-wife, Sarah Ferguson, the Duchess of York and his sister Princess Anne. 

Shortly after their arrival, King Charles, who is currently undergoing treatment for cancer, arrived by car alongside his wife Queen Camilla, marking his most significant public appearance since his diagnosis. 

The monarch, 75, appeared in a good mood, greeting well-wishers in a bid to allay the public's fears following a turbulent few weeks that saw the Princess of Wales, 42, also diagnosed with cancer. 

In recent weeks, the realities of having a slimmed down monarchy have been laid bare. The King paused his public-facing duties in February, while Kate also stepped back due to her abdominal surgery and subsequent diagnosis.

Prince William is also taking some time away from the royal spotlight as he spends time with his wife and three children privately at their country home Amner Hall, where they can 'will close off from the world and move on'.

Today's event proved to onlookers that the Duke of York is well and truly back in the royal fold and will no longer shy away from the public limelight at a time where fewer senior royals are on hand. 

It marks an extraordinary turn around just two years after his late mother Queen Elizabeth banned him from royal duties and stripped him of his HRH as well as military titles. 

The extraordinary move came after Andrew settled a sexual assault case filed against him by Virginia Giuffre - a sex slave victim of Andrew's close friend Jeffrey Epstein.   

Today Prince Andrew was seen chuckling alongside his family members as they shook hands and spoke to the clergy.

The appearance - which would have been unheard of two years ago - comes just weeks after the Duke walked the Royal Family into Windsor Castle for a service of thanksgiving for the late King Constantine of Greece.

King Charles had been unable to attend the event as he continues to battle with cancer while Prince William had to duck out of the service last minute for 'personal reasons'.

It was later releveled that the heir had suddenly dropped out of the service as Kate had started her course of preventative chemotherapy, described as a 'recovery pathway'.

Queen Camilla took the reins at the event but arrived separately leading Queen Elizabeth's second born son to step forward and lead the more minor royals - such as Princess Anne, her daughter Zara and husband Mike Tindall - into the service.  

And in another incredible turn of events, his ex-wife was once again by his side as they marched into St George's Chapel followed by their daughter Beatrice. 

Biographer and royal expert Phil Dampier told MailOnline earlier this month that Andrew had seized his chance and still clearly hopes he can make a full comeback, with Fergie close behind.

He said: 'We have been reminded of the fragility of the situation and Andrew will probably be encouraged to think he can one day make some sort of comeback, although it’s not likely for at least a year or two, if ever'.

Andrew's appearance at the late Greek monarch's memorial marked the first time he had been seen at a public event since the Christmas Day service at Sandringham.

It came almost two years to the day that his settlement with Ms Giuffre was disclosed - estimated to be worth around £12million ($16.3million).

The move spared him having to give evidence under oath at any trial in the US and there were claims that the Queen helped him pay for it.