Robbie Williams will turn on the Christmas lights later this evening at Oxford Street in London.
The 38-year-old from Stoke-on-Trent will be joined by Leona Lewis and Lawson.
Tens of thousands are expected to attend the event, which will be ticketed for the first time.
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Blessings are church services acknowledging the commitment made in a marriage or civil partnership, in which God's blessing is sought.
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Birmingham's Church of Scientology will open in Moseley today, ten years after the building was acquired.