Darren Criss Performs Beethoven By Britney Spears

It's Britney, Britain: Spears performs in London

Kaley Cuoco Performs "Slave 4 U" By Britney Spears

Kaley Cuoco Performs Britney Spears' 'I'm A Slave 4 U' on 'Lip Sync Battle'

Clark Gregg performs Britney Spears' "Toxic" | Lip Sync Battle

Lip Sync Battle: Clark Gregg performs Britney Spears' "Toxic"

Clark Gregg performs Britney Spears' "Toxic" | Lip Sync Battle

It's Britney, Britain: Spears performs in London

Britney Spears performs in Manila for first time

Clark Gregg performs Britney Spears' "Toxic" | Lip Sync Battle

Glee Cast Performs Toxic By Britney Spears with Mr Schuster.

Britney Spears Performs At Planet Hollywood For First Time Since Since Vegas Tragedy

A Drunken Darren Criss Performs "Teenage Dream"

Darren Criss Performs Not Alone Barack Obamas Inauguration Jan 19 2013

Darren Criss Performs Acoustic Teenage Dream

GLEE - Darren Criss Performs- Something's Coming Full

Darren Criss Performs 'I Wanna Be Like You' - The Disney Family Singalong

GLEE Darren Criss Performs Hopelessly Devoted To You Full Video

GLEE: Darren Criss Performs - It's Not Unusual By Tom Jones

Britney Spears' manager denies claiming Britney may never perform again

Jamie Lynn Spears performs live Ms Mississippi and Oops I Did It Again

Britney Spears threatens to stop performing

Britney Spears Might Never Perform Again

Britney Spears will not perform again if...

Britney Spears will perform again

Britney Spears performing at the mall