In fact, despite differences in their personalities, the Chicago Fire star seems to suggest it was simply meant to be.
"I'm reserved. She's not. For whatever reason, it works," the 32-year-old actor told E! News' Jason Kennedy at NBCUniversal's Golden Globes afterparty in Beverly Hills on Sunday, Jan. 12.
He added, "It works and that's that."
Kinney and Gaga certainly proved just that at the shindig, where they had no problem packing on the PDA. The two shared a passionate kiss as they entered the A-list event held at the Beverly Hilton Hotel.
She playfully revealed, "He is extremely strange, actually, and we complement each other's weirdness."