Cheryl has paid an emotional tribute to her friend Sarah Harding on what would've been the Girls Aloud star's 40th birthday.The much loved star tragically died on September 5 at the age of 39 months after she was diagnosed with breast cancer.Cheryl has shared a fun montage of her time in Girls Aloud, and especially some of Sarah's best moments.The video, which was more than a minute-and-a-half long, showed the girls having fun on-stage, backstage, on television shows and featured Cheryl and the other members speaking about Sarah.In the caption, Cheryl wrote: "Memories may be all we're left with, but they're enough to last a lifetime," adding a sparkle emoji and "#Sarahs40th" to the end.The video featured a throwback clip of Cheryl speaking.
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