The music icon revealed the news ahead of Sunday's headline performance.
The release is in honour of the Queen's 90th birthday.
Welsh mezzo-soprano Katherine Jenkins will record a unique version of the national anthem to commemorate the Queen's 90th birthday.
The song will be available to download at no cost to everyone for 24 hours on April 21st – the actual birthday of the Queen.
Besides this, the 35-year-old has also written a special song called 'The Mother's Heart' in honour of the occasion and will perform it at The Royal Albert Hall on June 18th (the Queen likes to celebrate in June instead).
Both songs will be included on Katherine's album 'Celebration' which is out on April 22nd and will be "bursting with patriotic spirit".
And as if all that wasn't enough, the singer is also donating the entire advance for the upcoming album to the Queen's Diamond Jubilee Trust.
Well, she's not an OBE for nothing!