Britney Spears Has "Nervous Energy" Before Tour Kick-Off Tonight

Britney Spears kicks off her world tour -- her first concert tour in fives years -- tonight in New Orleans. What can fans expect?

"You can expect spectacular-ness," her manager Larry Rudolph said on Ryan Seacrest's KIIS-FM radio show Tuesday. "We ran the show twice yesterday until 2 or 3 in the morning, and it was amazing ... perfect. She goes full- speed the whole show - about an hour-and-a-half. It's pretty intense."

"There's only one time where it slows down - with two ballads in the middle," he added. "This is a full-blown, full-out Britney Spears show. It is a pop extravaganza. It is everything everybody expects from her -- and more!"

Rudolph went on to say that the Circus tour might be Spears' "best one" yet.

"There are so many highlights to this show. The costumes are amazing," he said. "It's the biggest production out there and maybe the biggest production ever launched. We have circus performers, aerialists, dancers, martial artists -- we have all kinds of things."

Spears is "a little" nervous, he added.

"She has this nervous energy. She's got this way of channeling it," said Rudolph. "I've said to her before that if you were on a football team and you were going to the Super Bowl, they'd want you to be their quarterback. When it comes to game day, nobody brings it like she does. She takes that nervous energy and turns it into the most amazing show."

Her average tour day: "She'll probably sleep late ... probably get up, have breakfast, and we'll leave to go to the venue at around 4-4:30, spend a little time, relax, hair and makeup around 6 or 7 and stage thereafter."