The 25-year-old singer - who is set to tie the knot with fiance Sam Cooper in Gloucestershire, South West England, on June 11 – plans to mark the end of her days as a single woman by gathering a large group of friends together in the posh hotel.
A source told the Daily Star newspaper: "Lily wants to bring some glamour to her hen night. She's been joking that she's old so wants a good pot of tea, scones and knitting, but knowing Lily it will no doubt turn into chaos."
One person who is sure to be helping Lily organise the party is close pal and chief bridesmaid, TV presenter Miquita Oliver.
A source said: "Lily and Miquita have been friends since childhood so there was always going to be a good chance she would be the maid of honour.
"Miquita knows Lily inside out and is bound to put on a great party for the hen do. They've grown up a bit now but both of them still know how to hit it hard."