Happy Birthday Sister

Treat your sister to something special with our birthday card cakes for sisters. Each gift includes a card of your choice and two delicious cake slices, delivered straight through the letterbox. It’s a sweet way to celebrate her big day – even from afar.

Explore more options with our Happy Birthday Mum or All Birthday Cards collections.

A Birthday Gift She Won’t Expect (But Will Love)

She’s your best friend, your partner in crime – or maybe your favourite sibling. Either way, she deserves more than a plain old birthday card. Our cake cards for sisters combine a thoughtful message with tasty cake slices in one unique gift.

Whether she’s into fun, heartfelt, or cute designs, there’s a card for every kind of sister – and cake flavours she’ll actually want to eat.

What’s Inside a Sister Card Cake?

  • 🎂 Two delicious slices of cake in your chosen flavours
  • 💌 A range of beautiful, cheeky, or sentimental card designs
  • 📝 Add your personalised message during checkout
  • ✉️ Sent straight to her door in letterbox-friendly packaging
  • 🚚 Fast UK delivery available

Make Her Smile – Even From a Distance

Whether you’re celebrating in person or sending love from afar, our letterbox birthday cakes for sisters deliver something thoughtful, tasty, and totally unique.

All of your 'Happy Birthday Sister' questions answered below

FAQ's

What is a birthday card cake for sisters?

A birthday card cake is a greeting card paired with two slices of cake, all packaged together for letterbox delivery – perfect for birthdays.

Can I personalise the card for my sister?

Yes! You can add your own message at checkout, making each gift feel extra personal.

Will it fit through the letterbox?

Yes, all our card cakes are designed to be delivered even if no one’s home.

Is this a good gift for long-distance birthdays?

Absolutely – it’s made for that! Surprise your sister no matter where she lives in the UK.