"Happy 90th Birthday, Dad!" the singer wrote on Wednesday, October 11. "Leave doting comments about my dad below. He'll scroll through it. Also please stop this train. Thank you."
"Stop this train," of course, is a nod to his 2006 hit of the same name. In the song, the star says that he "had a talk with my old man" about getting older. "He said, 'Turn sixty-eight / You'll renegotiate / Don't stop this train / Don't for a minute change the place you're in / And don't think I couldn't ever understand / I tried my hand / John, honestly, we'll never stop this train,'" he sings.
Perry, 32, reacted to the sweet post in the comments section. "Looking fantastic as ever!" she wrote. "Happy birthday friend."
Perry and the "Gravity" singer split for good last year after dating on and off for three years.Read more at USMagazine