粉丝们在后台见到偶像时完全被迷住了，激动得说不出话来。

The fans were completely ___star-struck when they met their idol backstage, too excited to even speak.

见到偶像的那一刻，她完全被迷住了，站在那里一句话都说不出来。

She was completely ___star-struck when she saw her idol, standing there speechless.