GIVING A SLAP-DOWN

LADY GAGA, 29, slapped Taylor Kinney when he kissed her for the first time.

The singer met the Chicago Fire star when he starred in the video for her 2011 single You and I and he caught her off-guard with an unscripted lip lock, prompting her surprised reaction.

Kinney recalled: “I remember I went up, and we’re rolling, and I kissed her and she didn’t expect it. They cut, and she slapped me. And it was just awkward.”