The pop superstar made a cameo appearance as herself on the musical drama series last year, but actor Matthew Morrison - who plays teacher Will Schuester - says it was difficult for the regular cast members to get on set the day she arrived for filming.
He said: "What was Britney like? I don't know - I didn't get to meet her. Not many people did.
"She had pretty big security around her. We actually had security bands to get onto our set that day."
While Matthew appears unimpressed with Britney, he loves Gwyneth Paltrow's guest stints on the show and thinks she has been able to reinvent herself.
He said: "Gwyneth Paltrow has definitely been my favourite guest. 'Glee' gives people a chance to reinvent themselves. I think Gwyneth does a lot of serious shows, but she really made fun of herself on 'Glee' and proved to be a goof."
The 32-year-old singer-and-actor also revealed he would love to see Adele make an appearance on the programme.
He told Now magazine: "I'd love to have Adele on. She's someone who has a good sense of who she is. She'd be incredible."