You can send Meghan Markle a card when Baby Sussex is born — here's how

Baby Sussex is set to arrive in just a few short weeks. But besides popping the champagne and donating to your favorite baby-related charity in Meghan Markle and Prince Harry's honor, wouldn't it be amazing if you could actually send them a note with your official congrats?

Good news: You can, and if you do it in a timely fashion, you might even get a response.

The best address for sending snail mail to Harry and Meghan's attention is this:

THR Duke & Duchess of Sussex
Clarence House
LondonSW1A 1BA
United Kingdom

What you say is entirely up to you: Just be sure to pick a clever card and include a lengthy note with positive (royal) wishes. (Hey, you could even include an early guess on the baby name.)

We already know that Meghan is a fan of putting pen to paper (remember her calligraphy skills?) so the odds are good that you'll get a reply—and maybe even a handwritten one at that.

Still, before you pop it in the mailbox, you'll want to be 1000 percent certain of two things:

1. You put the correct amount of international postage on the card. (Depending on the size of the card, it can vary, so be sure to check with your local postman or look online.)

2. Do not—we repeat, do NOT—forget to include your return address. (Kind of a biggie if you want an official reply.)

Let the countdown begin.

RELATED: Here Are the Royal Thank You Cards Meghan Markle Sent to Those Who Wished Her a Happy Birthday

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Meghan Markle shows off her baby bump in white
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Meghan Markle shows off her baby bump in white
LONDON, ENGLAND - FEBRUARY 12: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex attend a Gala Performance Of 'The Wider Earth' at Natural History Museum on February 12, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - FEBRUARY 12: Meghan, Duchess of Sussex attends a gala performance of ‘The Wider Earth’ in support of the Queen’s Commonwealth Trust & the Queen’s Commonwealth Canopy at the Natural History Museum on February 12, 2019 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 12: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex arrive to attend a gala performance of ‘The Wider Earth’ in support of the Queen’s Commonwealth Trust & the Queen’s Commonwealth Canopy at the Natural History Museum on February 12, 2019 in London, England. (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - FEBRUARY 12: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex arrive to attend a gala performance of ‘The Wider Earth’ in support of the Queen’s Commonwealth Trust & the Queen’s Commonwealth Canopy at the Natural History Museum on February 12, 2019 in London, England. (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - FEBRUARY 12: Prince Harry, Duke of Sussex, Meghan, Duchess of Sussex and producer Trish Wadley attend a gala performance of ‘The Wider Earth’ in support of the Queen’s Commonwealth Trust & the Queen’s Commonwealth Canopy at the Natural History Museum on February 12, 2019 in London, England. (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - FEBRUARY 12: Meghan, Duchess of Sussex arrives to attend a gala performance of ‘The Wider Earth’ in support of the Queen’s Commonwealth Trust & the Queen’s Commonwealth Canopy at the Natural History Museum on February 12, 2019 in London, England. (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - FEBRUARY 12: Meghan, Duchess of Sussex attends a Gala Performance Of 'The Wider Earth' at Natural History Museum on February 12, 2019 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - FEBRUARY 12: Meghan, Duchess of Sussex attends a Gala Performance of 'The Wider Earth' at the Natural History Museum on February 12, 2019 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
Britain's Prince Harry, Duke of Sussex (2L) and Meghan, Duchess of Sussex (C) arrive at the Natural History Museum in London on February 12, 2019. - The Duke and Duchess viewed the gala performance of The Wider Earth. The Wider Earth is a theatrical production about the young Charles Darwin's expedition on HMS Beagle. (Photo by Niklas HALLEN / AFP) (Photo credit should read NIKLAS HALLEN/AFP/Getty Images)
LONDON, ENGLAND - FEBRUARY 12: Meghan, Duchess of Sussex attends a gala performance of ‘The Wider Earth’ in support of the Queen’s Commonwealth Trust & the Queen’s Commonwealth Canopy at the Natural History Museum on February 12, 2019 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 12: Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex attend a gala performance of ^'The Wider Earth' at Natural History Museum on February 12, 2019 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - FEBRUARY 12: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex attend a gala performance of ‘The Wider Earth’ in support of the Queen’s Commonwealth Trust & the Queen’s Commonwealth Canopy at the Natural History Museum on February 12, 2019 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 12: Prince Harry, Duke of Sussex attends a gala performance of ‘The Wider Earth’ in support of the Queen’s Commonwealth Trust & the Queen’s Commonwealth Canopy at the Natural History Museum on February 12, 2019 in London, England. (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - FEBRUARY 12: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex arrive to attend a gala performance of ‘The Wider Earth’ in support of the Queen’s Commonwealth Trust & the Queen’s Commonwealth Canopy at the Natural History Museum on February 12, 2019 in London, England. (Photo by Heathcliff O'Malley - WPA Pool/Getty Images)
LONDON, ENGLAND - FEBRUARY 12: Prince Harry, Duke of Sussex attends a gala performance of ‘The Wider Earth’ in support of the Queen’s Commonwealth Trust & the Queen’s Commonwealth Canopy at the Natural History Museum on February 12, 2019 in London, England. (Photo by Chris Jackson/Getty Images)
LONDON, ENGLAND - FEBRUARY 12: Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex attend a gala performance of ^'The Wider Earth' at Natural History Museum on February 12, 2019 in London, England. (Photo by Samir Hussein/WireImage)
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