Speaking to Canadian HELLO! back in 2015, the then Suits star revealed she splurged on a special accessory when the show was renewed for a third season.
"I’ve always coveted the Cartier French Tank watch. When I found out Suits had been picked up for our third season – which, at the time, felt like such a milestone – I totally splurged and bought the two-tone version," she told the publication.
But the watch will one day belong to Lili as Meghan had a special message engraved on it.
"I had it engraved on the back, 'To M.M. From M.M.' and I plan to give it to my daughter one day. That’s what makes pieces special, the connection you have to them."
The Cartier Tank Watch comes in many styles and ranges from AU$5,100 to AU$44,000.
The Cartier watch isn't Meghan's only sentimental piece of jewellery.
Her engagement ring has a link back to her late mother-in-law Princess Diana, whose name is also Lilibet's middle name as it features two round diamonds (estimated at just under a carat each) from Diana's personal jewellery collection.
"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," she said during her and Harry's official engagement interview in 2017, adding that the ring is "incredibly special."
Meghan has also worn Diana's famous butterfly earrings and for her and Prince Harry's explosive interview with Oprah Winfrey, donned a diamond tennis bracelet that looks very much like a piece from her late mother-in-law's collection.
News of Lilibet's arrival broke on Monday morning, Australian time.
A spokesperson for the couple announced: “It is with great joy that Prince Harry and Meghan, The Duke and Duchess of Sussex, welcome their daughter, Lilibet “Lili” Diana Mountbatten-Windsor, to the world. Lili was born on Friday, June 4 at 11:40 a.m. in the trusted care of the doctors and staff at Santa Barbara Cottage Hospital in Santa Barbara, CA.
"She weighed 7 lbs 11 oz (3.48kg). Both mother and child are healthy and well, and settling in at home."