This is so precious!!
But now, we have picture proof!
The proud parents (minus Prince George) posed outside St. Mary's hospital for all to see.
They're positively glowing! We can't wait for an updated family portrait to be released!
Partygoers said they saw the two arrive to the party together, but that wasn't all.
"[They] kept grabbing each other's hands and Diplo kept pulling Katy in."
After their many moments of PDA, Katlo headed towards the dance floor and hung out with a number of famous pals, including Girls' Allison Williams!
How super adorable!
Things probably aren't getting too serious for the two, but all that matters is if they're having fun with each other!