The Queen's Diamond Jubilee Concert on Monday brought superstars together on one stage.
[Related gallery: Diamond Jubilee beacons lit across the world]
The X Factor judges now and then sang 'Need You Now' on stage outside Buckingham Palace, in front of 10,000 ticketholders from the general public and the Royal box which included Prince William, Kate Middleton, Prince Harry and Prince Charles.
As Prince Philip was hospitalised during the day with a bladder infection, the Queen arrived later so missed Gary Barlow and Cheryl Cole's duet. Get well soon Philip.
Cheryl Cole did get up close to the Queen at the big Diamond Jubilee Concert finale, however, as she was positioned on stage just behind the guest of honour. Perks of being Gary's duet partner.
[Related article: Go backstage at Queen's Diamond Jubilee Concert]
In fact, that was the highlight of Cheryl Cole's night, as she tweeted a picture of the Queen smiling at her with the caption: "This image will live with me Forever.. I could never have dreamed of this moment.. #GodSaveOurQueen #Honoured"
The 28-year-old wore a strapless gown by Polish designer Ewa Minge, which featured a dramatic white and black fishtail. Cheryl Cole also went for the long train style at Cannes Film Festival.
Jessie J also impressed at the Diamond Jubilee Concert in her floor-length gown complete with blue feathers, gold embellishment and a thigh-high split.
The Voice UK coach teamed up with her costar Will.i.am to duet on Black Eyed Peas 'I Got a Feeling' before Jessie J launched into her own hit, 'Domino'.
It looked like Will.i.am had taken style inspiration from his protégée Cheryl Cole, as he donned a red military jacket as was Cheryl's look back in the 'Fight For This Love' days.
Will.i.am took to the stage much later in the Diamond Jubilee Concert to duet with Stevie Wonder, when the legend spontaneously burst into 'Happy Birthday'.
[Related article: Kate Middleton wears same dress as Tulisa at Queen's Diamond Jubilee]
A hula-hooping Grace Jones also wished the Queen a happy birthday. Oops.
The Diamond Jubilee Concert ended with the Queen taking to the stage to light the National Beacon.
A fireworks display then lit up the London skyline. What a night.