Designer: Beyonce Was 'Losing Weight Every Day'

ET spoke exclusively to Beyonce's costume designer about her her rigorous rehearsals and how much work went into her outfits.

Save videos for later by signing up or logging in

With "My Queue" you can quickly save videos to watch later.

To add an item to your queue just click the sign next to the video.

Once you've added a video visit "My Queue" to start watching!