Missy and Meghan met on Tuesday night at a reception hosted by the Governor-General at Admiralty House.
The Aussie songstress also introduced Meghan to her new bub, Luna.
“What an honour to meet the beautiful Duchess today! She was such a sweetheart. I said I felt sorry for her having to do all these meet-and-greets while 4 months pregnant! What a trooper,” the 35-year-old singer wrote.
Yep, Missy let slip that the Duchess is four months pregnant!
That means Baby Sussex will be arrival in April, 2019.
"Prince Harry was gorgeous too, a real charmer," she also told fans.
"He squeezed Luna’s legs and said “who’s this little cutie?” Looking forward to telling Luna she slept through it all one day."