Pop star Lily Allen is giving fans the chance to win tickets to her U.K. stage comeback - by ordering them to build a famous landmark out of food.

The Smile hitmaker is set to make her performing return at Robbie Williams' concert at the London Palladium next week (08Nov13), and has promised to dish out several tickets to fans on Twitter.com.

However, Allen has added a twist - she wants entrants to create a replica of a famous building using just snacks.

She writes, "Ok , so I've got 5 pairs of tickets to give away to this Robbie/me/miss piggy/Kermit thing at the palladium next week. Need to devise game.

"Tickets competition .Could you please build and photograph a famous landmark/building using only biscuits. Photo must include proof of date."

She later changed her mind, allowing all food groups due to the bad weather battering Britain on Monday (28Oct13). She adds, "Actually, you can use any food, but only cause there's a storm and I don't want anyone endangering themselves getting biscuits."

The Muppets stars Miss Piggy and Kermit the Frog will also perform with Williams at the event.

Allen announced her retirement from music in 2009 so she could focus on motherhood, but confirmed to fans earlier this year (13) that she had gone back into the studio to work on new material.