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DJ Ted Lavender is related to Allen's family
The "Smile" singer has asked her half sister's Sarah's half brother to dj at her wedding reception to Sam Cooper.
Lavender spins ska and reaggae records under the name Ted at the Controls.
"I do a lot of practising in my bedroom and I don't get nervous, except at the beginning," the 12 year old told The Sun newspaper "But mostly it's just really exciting when the crowd gets going. Lily's really nice and I'm looking forward to really rocking her party."
Allen will marry builder fiancé Sam Cooper in Gloucestershire on June 11.