As Season 2 resumes Sunday, revisit the A-listers who've popped by McKinley High
Spears was a fantasy girl for McKinley High's Glee club singers on Season 2, who hallucinated about her while under anesthesia at the dentist. As ditzy Brittany (Heather Morris) sees herself in the "Me Against the Music" video, Spears stepped in for a sexy chat. Gasps Brittany: "You're really hot!"
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