Adam Lambert is being stalked by a streaker, but it's all in good fun.

The singer was streaked by a fan during his homecoming show at Mt. Carmel High School in San Diego, Calif. while he was competing on 'American Idol.' That same Glambert was up to her old tricks again -- four years later -- streaking the singer at his performance at the Del Mar County Fair on Tuesday, July 2.

While performing the title track of his debut album 'For Your Entertainment,' the streaker whizzed by in a bra. She high-fived the singer who was totally smiling at her antics.

The streaker, named Katelyn Greathouse, was lucky that Lambert was amused by her efforts and had her back. At the end of the video, you can hear him say, "Don’t tackle her! Be nice to the girl... She didn’t do anything wrong. I hope it was a live feed. Let her keep the footage, she didn’t hurt anybody."

She is nothing, if not dedicated and he is nothing, if not a good sport.