The girls of "Glee" are used to doing covers ... but this time it's not a song they're covering, but Marie Claire magazine.

Lea Michele, Amber Riley and Dianna Agron appear together for the May issue's cover -- and will get their own closeups on special individual covers as well! Check out the alternate pics in the gallery.

We've also got a sneak peek at next week's brand new episode of the hit FOX show, where Gwyneth Paltrow's Holly Holiday returns -- and reportedly sings Adele.

The episode will also see the return of Cheyenne Jackson, Jessalyn Gislig and Stephen Tobolowsky.

Check out all the preview pics above!

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