Kate couldn't stop giggling as Bradley Walsh opened the Royal Variety Performance show with an awkward joke about being snubbed for an MBE and OBE at the star-studded show.
The show's host Mr Walsh opened the event with a few jokes, one of which was about him being snubbed for an MBE and OBE.
Addressing Prince William, he said: 'I have worked for your greatnan, your nan, your granddad, your dad, and now I'm working for your Sir and Madam.
'And I must say - ask me if I've got an MBE. Nah, ain't got one. Ask me if I've got an OBE - nah, ain't got one of them. Ask me if I've got a CBE - no!'
He went on to say 'they've probably run out' of those honours because 'they give them all to people who row boats' and 'people on telly who bake cakes'.
Mr Walsh said he 'entertained troops in the Falklands' and was 'happy to make it out alive' while others got commended for their 'victoria sponge' cakes.
Kate couldn't stop giggling as Bradley Walsh opened the Royal Variety Performance show with an awkward joke about being snubbed for an MBE and OBE at the star-studded show
William and Kate entered the event with beaming smiles (pictured) before they settled into the balcony with the Swedish royals
Mr Walsh's (pictured) awkward joke started with him greeting the 'royal highness, or royal highnesses', with him pretending to stumble over the word several times
He also told an anecdote of meeting his two-year-old grandson, who he claimed also used the term 'royal highni' to refer to the Prince and Princess of Wales.
Earlier Mr Walsh had greeted the 'royal highnesses', with the camera switching to William and Kate as they laughed away.
He pretended to stumble over the word 'highnesses' several times.
'It doesn't sound right, your royal highnessesses? There's too many "ssessess", innit? Your royal highness... your royal highnessesses?,' he said.
'It should be like cactus, cactussess, cacti. Your royal highness, highnessess and highni. That's it. I've got it. Your royal highni.'
The Prince and Princess of Wales stood up for the national anthem God Save the King
The Prince and Princess of Wales arrive to attend the Royal Variety Performance at the Royal Albert Hall in London yesterday
The show was opened with an amazing rendition of God Save the King
William says farewell to Princess Victoria of Sweden after watching the show together
The Prince and Princess of Wales laugh with Paloma Faith during the evening at the Royal Albert Hall
The Prince and Princess of Wales applaud during the Royal Variety Performance
The Princess of Wales waves in her striking blue dress as she steps out alongside Prince William at the show in London
The Princess of Wales beamed and looked effortlessly elegant as she attended the event
William and Kate appeared to put drama behind them as they headed home looking like they'd had a great evening
The Prince of Wales talking to a Cher who was among the stars at the Royal Albert Hall last night
The Prince and Princess of Wales shake hands with members of McFly during the Royal Variety Performance
The couple share a joke with Hannah Waddingham during the Royal Variety Performance
Prince William speaks to Rick Astley at last night's glamorous evening event at the Royal Albert Hall
Meanwhile Kate and William were seen laughing awkwardly at the joke at their expense.
The Princess and Prince of Wales attended the event at the Royal Albert Hall with Crown Princess Victoria of Sweden and her husband Prince Daniel, who were in the UK on an official visit.
William and Kate entered the event with beaming smiles before they settled into the balcony with the Swedish royals while the crowd was giving them a standing ovation.
Among those performing at the show were Rick Astley, McFly, BGT winner Viggo Venn and Cher. There was also a celebration of Disney's centenary and a tribute to theatre impresario Bill Kenwright.
More to follow.