The singer dressed as Rose Dewitt Bukater for the night, complete with perfectly-curled ringlets.
She even reenacted that iconic staircase moment for her grand entrance:
"Dirty 30! I’m not sure what I’m going to do for the next 30 years as I’ve been blessed beyond words in my life so far," she captioned the photos.
"Thank you to everyone for coming along for the ride the last 11 years with me. My family and friends for entertaining my super fandom of the Titanic movie. Last night was the best night of my life. Here’s a couple pics. I’m absolutely fucked, not sure I’ll make it out the house again!"
The singer then praised Donald Glover, finishing with: "Ps Childish Gambino how the hell do you have time to offer us so much greatness on so many platforms. I adore you x."
Guests included Alan Carr, Zane Lowe, and Mark Ronson and Aaron Paul and his wife, Lauren.
Adele previously shared her love of the Titanic movie when she posed with Celine Dion wearing Celine's face and a picture of the ship.