The phrase is lip syncing. But I don't think so, it just sounds very similar to the studio version since this song isn't very hard for her to sing. Certain points sound different than the actual song. Although I wouldn't be surprised if the background singers were lip syncing.

it didnt even look obvious that bey was already preggers during that time
but i dont think she was to answer ur question

Well Roseland was a concert full of pre record vocal, I was so disappointed of this concert...

fixed

maybe I can't tell. I just know that annoying echo that was on her mic when she was talking stopped when she started singing

I thought Roseland was live?
Didn't they just use audio from one night and patch it with footage from multiple nights hence making some bits look a bit dodgy?

yes, she usually does.

Why was this reported I'm just asking a question

Yes.

That DVD is pretty forgettable.

Waiting for the real deal: R E V E L

no

Yes.

Don't try it sis... She does not every time, but at Roseland she was pregnant and probably tired, she couldn't pull a full choreography that's probably why she butchered the DVD with those Messy EDIT...

And let's not talk about GaGa throwing up and singing in the same time...

No.

Ditto.

Yes. She lips most of the time.

Really?

I had no idea. To answer the question IDK but I wouldn't be surprised.

Just know this Beyonce can out sing out perform your fave any day of the week.