It isn't often that Katie will post photos of her only child on Instagram, and when she does, her face is often obscured.
Still, what we can see is a crystal-encrusted tiara, gigantic bow and what looks like a headband of tulle atop the birthday girl's head.
The last time Katie posted a photo of her daughter was back in January:
Katie and Suri live together in New York, where they're regularly papped out and about. The pair made their first official public appearance in December 2017, when they introduced Taylor Swift as the final act of New York's annual Jingle Ball concert.
"She's one of our favourite performers," Katie began when they took to the stage. "Who is it, tonight?" she aimed at her daughter. Suri then enthusiastically exclaimed "Taylor Swift!"