Taylor Kinney, Lady Gaga Taylor Kinney, Lady Gaga

Even Taylor Kinney can't explain the secret behind his relationship with Lady Gaga.

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"I'm reserved. She's not," the Chicago Fire star told E! News at NBC's Golden Globes afterparty on Sunday night. "For whatever reason, it works. It works, and that's that."

The pair have been an item since 2011. Though they are rarely seen in public together, they were photographed holding hands and smooching as they entered the party at the Beverly Hilton Hotel after the Globes.