BRITNEY FILMED SCENE FOR MADONNA TOUR! Sounds Funny!

Us Weekly Reports: Britney Spears filmed a claustrophobic elevator scene in Santa Monica Wednesday to be used on Madonna's Sticky & Sweet tour, a source confirms to Usmagazine.com.

"She [was] shot in the elevator that is surrounded by seven cameras," a source tells Us.

"Britney walks into the elevator wearing a black hoodie, and you can't see it's her at first," the source adds. "As the elevator goes up, it becomes clear it's Britney and she's anxious and nervous."

Realizing she can't get out, she "starts to kick the wall and hit things," the source adds. "At one point she screams into the camera."

Her parting shot? Spears, 26, takes off her hoodie, looks straight into the camera and says her infamous lyric: "It's Britney, b-tch!"

Spears – sporting long, platinum blonde hair – arrived at The Lots in Santa Monica at 9 a.m. Wednesday morning to record her part.