People magazine reported the Grammy victor began dating the 49-year-old talent agent in February 2017.
However, the Poker Face singer didn't confirm anything until October 2018, when she thanked her "fiance Christian" in her speech.
Espectacular cambio físico de Chicote
Su nueva imagen se convirtió en uno de los aspectos más comentados de la tarde de este domingo en las redes sociales. El chef reconoció que el cambio físico es cuestión de "comer mejor y hacer algo de ejercicio" .
She's off the deep end, watch as she dives in... to marriage! "When I went backstage, Christian was by the stairs making sure I was okay", she said.
Who was Lady Gaga dating before?
She has been seen wearing what appears to be an engagement ring for most of this year.
Gaga was previously engaged to Chicago Fire star Taylor Kinney but the pair split back in July 2016 after five years together.