Kate Middleton swaps out of wedding band for new 'eternity ring' and rewears old Ralph Lauren t-shirt as she sends congratulatory message to Team GB

The Princess of Wales debuted a new 'eternity band' and rewore an old Ralph Lauren t-shirt as she sent a congratulatory message to Team GB last night.

The royal, 42, appeared alongside the Prince of Wales, 42, in a star-studded video which was shared on the couple's Instagram yesterday.

For the uplifting video, the mother-of-three wore a black-and-white striped top from Ralph Lauren.

The designer top, which originally retailed for £85, has been a staple in Kate's wardrobe since 2013.

The royal was first spotted wearing the long-sleeved t-shirt while food shopping in Anglesey in August 2013 and later wore it to an official SportAid charity event at the Olympic Park in London two months later.

Pictured: The Princess of Wales wore minimal jewellery and a £85 Ralph Lauren striped t-shirt for a congratulatory message for Team GB last night

In the congratulatory video, Kate wore minimal jewellery - opting for a thin silver choker-style necklace and no earrings.

The Princess was also seen with a new band on her wedding ring finger, leading royal fans to speculate it is an eternity ring. 

The thick gold ring appeared to be set with diamonds and sapphires, which would match the royal's engagement ring that once belonged to Princess Diana.

Commenting on the Royal Fashion Police Instagram post, one wrote: 'The sapphire anniversary/eternity band is a lovely alternative to her engagement ring. 

'Nice to have a ring with a lower profile for everyday casual wear.'

In response, another added: 'I think it's beautiful and probably a more reasonable everyday ring.' 

Another added: 'That sapphire band sure looks far more practical for daily living and it sure is pretty.' 

The Prince and Princess of Wales celebrated their 13th wedding anniversary this year and marked the occasion by sharing a new black-and-white portrait from their nuptials. 

The Princess was also seen with a a new band on her wedding ring finger, leading royal fans to speculate it is an eternity ring (pictured)

Pictured: The Princess of Wales seen wearing her £85 Ralph Lauren striped t-shirt to attend a SportsAid Athlete Workshop at the London Olympic Park in 2013

In the short clip, Prince William stood by her side in the Instagram video and sported an unusually rugged look, with an unshaven appearance.

Kate said: 'From all of us watching at home congratulations to Team GB.'

The Prince of Wales, wearing an official blue Team GB top, then briefly added: 'Well done to Team GB you've been an inspiration to us all.'

In an accompanying social media post on their account, the royal couple said: 'Well done @teamgb, what an incredible journey!

'Every athlete showed immense dedication, heart and passion. You made us all so proud!

'Here's to celebrating every triumph @paris2024 and looking forward to more from @paralympicsgb_official later in the summer'.

Rapper Snoop Dogg, who has been presenting for American broadcaster NBC at the Olympics, also features in the star-studded video

Former England captain and football icon David Beckham congratulated Team GB as broadcaster Gabby Logan said they had created 'memories that will last a lifetime'

Former American sprinter Michael Johnson, who has been presenting for the BBC at the Olympics, wryly said Team GB had done a 'good job - though not quite as good as the US' as former Heptathlon champion turned broadcaster Jessica Ennis-Hill said, 'Well done Team GB'

In a post on social media, the royal couple spoke about the 'incredible journey' of Team GB

In March, the Princess of Wales announced in an emotional video message that she is receiving cancer treatment and has made few public appearances since.

In June, Kate attended the Trooping the Colour celebrations in London and recently watched the Wimbledon men's singles final with Princess Charlotte. 

Kate and William's beaming video came shortly after a heartfelt statement from King Charles III, in which he called all Olympians 'an inspiration'.

The monarch congratulated their 'outstanding successes' and singled out their 'raw talent, true grit and hard toil' in the message, which came just hours before the final moments of the Olympic Games in the French capital.

In the viral video, which has already received more than 450,000 likes, former England captain and football icon David Beckham also gave a message of support.

Pictured: The Princess of Wales announced in an emotional video message that she was receiving cancer treatment in March

The Princess of Wales made her first public appearance since her cancer diagnosis at the Trooping the Colour in June

Last month, the Princess of Wales attended the Wimbledon men's singles final in London with Princess Charlotte

He said: 'Hey Team GB, we are so proud of you, congratulations.'

Broadcaster Gabby Logan said: 'You have been amazing. Thank you so much for everything. These memories will last a very long time.'

Retired American sprinter and broadcaster Michael Johnson wryly said: 'Great job Team GB, you did a great job, not quite as good as us in the US, but well done.'

Former Welsh athlete Colin Jackson beamed with delight as he told the Olympians: 'You smashed it.'

Broadcaster Emma Willis said it had been 'sensational to watch you over the last couple of weeks.'

Swimmer Rebecca Adlington had huge praise for Team GB. She said: 'Your performances have been absolutely fantastic.'

Former jockey and presenter Clare Balding said: 'I know how much you have lifted the nation and I just want to say thank you for that.'

American rapper Snoop Dogg, who has been a popular presence at the Olympics this year as a special guest presenter for US broadcaster NBC, rounded off the video.

With his usual trademark smile and informal personality, he said: 'Thank you Great Britain. On behalf of Snoop Dogg, the Prince and his lovely wife,' before clasping his hands together and bowing his head.