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And now they've gone one step further with a Percy Pig Celebration Cake! Just look at it...
Writing on Instagram, M&S explained: "If you thought we couldn't top our Percy Pig mini bites announcement earlier in the week then think again, because we're back, and this time we come with cake!
"It's bursting with fruity jam and Percy Pig flavour buttercream, finished with sprinkles and topped with Percy Pigs. You *could* wait for your next birthday to pick one up, but honestly, why would you?"
The new cake looks absolutely mouthwatering, with layers of delicious sponge, sandwiched together with pink buttercream and lashings of jam.
Of course, it's topped with plenty of Percy Pig sweets, as well as pink icing and hundreds of rainbow sprinkles.
Priced at £12, it's currently available in stores and is expected to drop online any time now.
The celebration cake is one of many Percy goodies M&S has treated us to this year.
Last week, M&S introduced Percy Pig Mini Bites and Percy Pig Swiss Roll - two new mouthwatering Percy treats to get your trotters on!
In stores now, the Percy Pig Mini Bites are described by M&S as "chewy mouthfuls of heaven" packed with fruity Percy Pig pieces, marshmallow, crispy rice pops and coated in white chocolate.
Meanwhile, the pink fluffy Swiss Roll is filled with Percy Pig flavoured buttercream, loaded with chewy Percy Pig pieces and topped with pink edible glitter.
We are truly spoilt for choice!
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