"It will never feel like the old Girls Aloud again but we’ve reached a point where we feel ready to celebrate all of it. Sarah included."
Her Girls Aloud bandmate Kimberley Walsh was on hand to get the party started.
The former bandmates joined Years And Years' Olly Alexander on stage for a special surprise for pop fans.
Sea Slug and Odd Socks were the latest contestants to leave the show – but who was underneath those colourful costumes?
Kimberley Walsh, Nadine Coyle, Nicola Roberts and Cheryl Tweedy hosted The Primrose Ball to raise money in Sarah's memory.
Cheryl, Nadine, Nicola and Kimberley took part in a 5km run to raise money in memory of their former bandmate who died of cancer last year.
"Sarah asked us to do this and it’s really important for us that we make it a big event."
'My Heart Is Broken': Kimberley Walsh Pays Tribute To Former Bandmate Sarah Harding Following Her Death
The singer and actor said Sarah's "infectious chuckle" was “one of my favourite things in the world”.
The singer celebrated turning 38 with her bestie and former bandmate, Kimberley Walsh.
Girls Aloud Rally Around Sarah Harding Following Cancer Diagnosis: ‘We Are With You Every Step Of The Way’
Cheryl, Nadine Coyle, Kimberley Walsh and Nicola Roberts have all lent their support to the star.