Queen Elizabeth II’s official birthday is being celebrated by Twitter with a crown emoji for fans to use when wishing the royal happy birthday. Since it is the milestone birthday of the British monarch, the social media apps wanted to create something special for the nonagenarian. Festivities will start from Friday for the official birthday weekend of the queen in the U.K.

The crown emoji featured purple and silver color embellished with pink, blue and green stones. It also has the number “90” written on the crown, for her 90th birthday. The purple and silver crown emoji will appear when fans tweet using the hashtags “#Queenat90” or “#happybirthdayyourmajesty.”

“With the Monarch celebrating such a milestone birthday, we wanted to enable Twitter users to mark the occasion in a truly special way on the platform. The crown emoji represents The Queen’s lifelong commitment and reflects people’s love and admiration for her on this special birthday,” said Dara Nasr, the U.K. managing director of Twitter.

He added that they could not wait for Twitter users to share their messages and join the conversation during the celebrations this weekend. Nasr also said that the special crown emoji was created to reflect fans “love and admiration” for the queen.

The queen first used twitter on Oct. 24, 2014 to send out a tweet to royal fans in front of 600 guests from the Science Museum. “It is a pleasure to open the Information Age exhibition today at the @ScienceMuseum and I hope people will enjoy visiting. Elizabeth R,” the queen tweeted.

Meanwhile, the royal family kicked off the queen's official birthday celebration with the annual National Service of Thanksgiving at St Paul's Cathedral on Friday. Elizabeth and Prince Philip were joined by Kate Middleton, Princes William and Harry. Also, Prince Andrew and daughters, Princesses Beatrice and Eugenie, also attended the event. Prince Anne, her daughter Zara Phillips and husband Mike Tindall, as well as Prince Edward and Sophie with their kids, were there to support the queen.

Elizabeth looked radiant as ever in a primrose yellow coat and hat by Angela Kelly. Crowds gathered sang a very happy birthday to Philip. Besides, William and Kate arrived with Harry. The Duchess of Cambridge looked stunning in a pale blue Catherine Walker dress with white appliquéd lace detail.

The mother-of-two topped her look with a Jane Taylor millenery hat, while her brunette tresses were styled into a chignon. She accessorized with necklace and matchign earrings. Kate also carried a nude clutch bag and wore matching high heels.