stars in one's eyes, have

Be dazzled or enraptured, especially with romance; also, be naively idealistic or optimistic. For example, Thinking about their coming marriage, they both had stars in their eyes, or Kit had stars in her eyes when she talked about the millions who would buy her recording. This idiom transfers the shining of stars to eyes shining with love or enthusiasm. [c. 1900]

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.