Katy Perry's Cape Crusade The Coverup

Katy Perry crossed the line when she showed favoritism for "American Idol" favorite Adam Lambert last week -- and unless you DVR'd the live show, you'll never see her pink Glambert cape again.

Katy Perry: Click to view!

If you go on iTunes and purchase Katy's performance from last week's "Idol", the closeup of her silk Glambert billboard has been altered -- you can't even tell there's writing on the cape.

The rest of the video is exactly the same -- we put the two different versions side-by-side so you can see.

Fox and iTunes both declined to comment.