Katy Perry let slip the unlikely celebrity she first shared her pregnancy news with.

The songstress, 35, admitted she confided in Harry Styles with her baby joy during a chance meeting on a plane.

According to her, "I saw him on a plane, it was so funny.  before I announced that I was pregnant.

"We were having a conversation and I was like: 'Yeah and I'm pregnant', just like off the cuff, cause I was like, what else do you say!"

"He was so happy for me, he actually, you know what he was so sweet. I was like crouching down by his seat on the plane and once I had told him that, he got up out of his seat and he’s like: 'Here, sit in my seat.'

Katy said Harry selflessly offered her his seat after seeing she was crouching, prompting her to describe him as a "complete gentleman".