The 'California Girls' hitmaker says she was grateful to be dating the 'Pirates of the Caribbean' actor as he celebrated his 42nd birthday.
He wrote on Instagram: "last selfie on a set in my 41st year ...i'm grateful and as I contemplate the passage of time I really feel age is just a number and we are not...we ARE the choices we make, the words we speak, the thoughts we create and the actions we take...they shape our realities...and as I say to myself and my son...make smart choices...happy me and my loyal companion "
Whilst Katy wrote in a since-deleted comment: "Glad I made the right choice doe. Happy birthday angel."
Meanwhile, Katy previously revealed "opposites attract" when it comes to her relationship with Orlando.
She said: "I think when you're attracted to someone, it's sort of like how opposites attract. I'm looking for that balance and maybe he's looking for someone who is a multi-tasker."
Her comments follow reports that the actor is feeling "very happy" in his relationship with Katy and is feeling "like a new person" as he's "matured" a lot since the first time they started dating.
The insider said: "He is ready to settle down with Katy. Being with Katy makes Orlando very happy. In the past, he seemed so scattered and unwilling to settle down. He is like a new person now and everyone is excited for him. Orlando is in a different place than he was last year. He has matured a lot. He realised that being single isn't that great after all. His relationship with Katy wasn't right the first time around, but it very much is now."