Queen at 90: Cara Delevingne, David Walliams and Katherine Jenkins among stars celebrating her birthday

As Queen Elizabeth II celebrated another year, scores of celebrities flocked online to join the Twitter party that was being held in the record-breaking monarch's honour.

Birthday messages came from across the globe and it didn't take long for the hashtag #HappyBirthdayYourMajesty to start trending worldwide. Supermodel Cara Delevingne, comedian David Walliams and Great British Bake Off champ Nadiya Hussain joining in the festivities. The Queen's good friend and ruler of Dubai Sheikh Mohammed posted a snap of the pair on Twitter. In the accompanying caption he described her as "remarkable", adding that he "greatly admires" her.

And it didn't stop there.

Today is the 90th birthday of a remarkable monarch I greatly admire . #HappyBirthdayYourMajesty pic.twitter.com/yAmpWnBvCZ
— HH Sheikh Mohammed (@HHShkMohd) April 21, 2016

This was an extremely proud moment for me, finally meeting Girls Aloud. #HappyBirthdayYourMajesty pic.twitter.com/NhRMYngGXt
— David Walliams (@davidwalliams) April 21, 2016

April 21 is a great day when you share your birthday with the @Queen_UK ðŸ‘‘ðŸ‘‘Happy 90th birthday ðŸŽ‚ðŸŽ‚
— Tatyana McFadden (@TatyanaMcFadden) April 21, 2016

Happy Birthday Your Majesty from your loyal subject & all @ukscouting #Queenat90 #HappyBirthdayYourMajesty
— Bear Grylls (@BearGrylls) April 21, 2016

Wishing the Queen a very happy 90th birthday! ðŸ‘‘ðŸ™†ðŸ¼ðŸ¾
— Tanya Burr (@TanyaBurr) April 21, 2016

Happy birthday mi lady ðŸ‡¬ðŸ‡§ For Queen and country ðŸ‡¬ðŸ‡§ https://t.co/HL2i0Mnmnx
— Cara Delevingne (@Caradelevingne) April 21, 2016

Who's still awake?The National Anthem is now available for a free download at https://t.co/dkEhOvFlnl #HappyBirthdayYourMajesty #Celebration
— Katherine Jenkins (@KathJenkins) April 20, 2016

#HappyBirthdayYourMajesty from everyone at #EastEnders. ðŸŽ‰ ðŸŽ‰
You're welcome back anytime. pic.twitter.com/esqvpKnxGQ
— BBC EastEnders (@bbceastenders) April 21, 2016

Queen Elizabeth is 90-years-old, and she's a badass: https://t.co/9bxVk0pF5H
— Ezra Klein (@ezraklein) April 21, 2016

Born on 21 April 1926 during the reign of her grandfather, King George V, she recently became Britain's longest-reigning monarch after 63 years on the throne.

On Thursday a historic image of England's Queen with her five great-grandchildren and two youngest grandchildren was unveiled. The iconic photograph was captured by celebrity photographer Annie Leibovitz and shows Her Royal Highness posing with James, Lady Louise, Mia Tindall, Savannah, Isla Phillips, Prince George and Princess Charlotte.

Queen Elizabeth II