The floral arrangements on their big day will feature white garden roses, which are one of Princess Diana's favourite flowers.
In March it was revealed that London-florist Philippa Craddock was chosen to create the flowers for the wedding in St George's Chapel.
Kensington Palace announced the arrangement 'will use seasonal plants including branches of beech, birch and hornbeam, as well as white garden roses, peonies and foxgloves'.
Kensington Palace's White Garden was made as a way to pay tribute to the late princess.
The stunning garden includes white lilies, white roses and large daisy flowers to celebrate the wonderful life of Diana.
Meghan Markle's engagement ring also includes two diamonds from Princess Diana's personal collection, which were handpicked by Prince Harry.
'I think everything about Harry’s thoughtfulness is – and the inclusion of that and obviously not being able to meet his mum it’s so important to me to know that she’s a part of this with us,' Meghan said about the ring.
Harry added: 'It is days like today when I really miss having her around and miss being able to share the happy news [of the engagement]. But you know with the ring and with everything else that’s going on I’m sure she’s...'
Meghan continued: 'She's with us.'