According to her Web site some of the remixed tracks include "Baby One More Time," "Do Something," "Piece of Me," "I'm a Slave 4 U" and "Womanizer." After the show, Britney Tweeted excitedly, "Just wrapped my first show in London. I love all the remixed tracks and new costumes!"

Although we're sure Spears' loyal fans loved the show, the same can't be said of some of her critics. The reviews are in, and some professional concertgoers described it as dull. The Sun said of Brit's performance, "Madonna is twice her age and does double the dancing."

Meanwhile, the Guardian made this point about the show: "It's not really about music, it's about gossip. ... Certainly there are moments when Spears could no more obviously be miming were she wearing white-face makeup and pretending to walk against the wind."

But the reviews weren't all bad. The Daily Mail said the performance was "relentlessly high octane and superbly choreographed," adding that the show is part of Britney's "remarkable comeback."

"[Y]ou don't come to see Spears for live, sweaty, musical grit and authenticity," the Daily Telegraph's reviewer wrote. "She is the queen of production line pop and reclaims that diamanté crown with the most perfectly plastic pop show ever staged." And we guess that's a good thing.

(Check out photos of the Circus here.)

These were many of the key elements to which that Britney stayed true when she finally debuted her much anticipated tour. But we noticed a few elements that seemed better suited to other pop stars.

For one, take the ringmaster jacket adorned with (fake?) fur epaulets. Many of you may remember it as a look that Killers frontman/fashionista Brandon Flowers debuted not long ago when the band released Day & Age. His shoulder pads, much to PETA's dismay, were made of feathers, but someone in Britney's camp (we're assuming it's her costume designers, DSquared2) must have loved the way that jacket looked and felt it would translate well for Britney. The jury is still out. That goes for Brandon, too.

Second, and maybe I'm alone in thinking this, but Britney's cop uniform seemed to be a vague throwback to the one that a Mr. George Michael wore in his post-arrest-for-sex-in-a-bathroom music video, "Outside." Why I have equated these looks is beyond me. As we all know, performers have a storied history of dressing as sexy cops (is there any other kind?) to suit some strange fantasy that might exist only in the minds of the people who run the Party City franchise.

In fact, those may be the same minds who created Britney Spears, so perhaps it isn't that strange after all.

Watch the video, after the jump!

Read more about Britney's workout sessions here.

It's been a long, strange week for me at MTV News. While many of my co-workers jetted off to L.A. to work on the VMAs, I stayed behind to hold down the fort. A handful of MTV Newsers and I spent all weekend cutting 30-second promos teasing our red-carpet show, a show I was really looking forward to seeing. Why? Because it was supposed to feature a piece I had written.

In the week leading up to the VMAs, I was asked to script a package about Britney Spears and Mariah Carey — neither of whom had ever won a Moonman. It was supposed to showcase the amazing videographies of both Britney and Mariah and play up the rivalry between the two. I spent hours working on the script, and my editor, Lee Dultz, estimates he spent nearly 48 hours over the span of a week carefully crafting a video package worthy of the the VMAs. But when our red-carpet extravaganza aired live, there wasn't enough time to air the video.

Of course, Britney was the big winner at the VMAs this year, taking home trophies for Best Pop Video, Best Female Video and Video of the Year, while Mariah once again went home empty-handed.

I thought my piece would never see the light of day, but we decided to give it a second chance on the Newsroom blog. So, without further ado, check it out. Britney and Mariah: A tale of two VMA losers.

The situation is being constantly updated but here is the latest.

Yes, she deserved to have her kids taken away. Yes, she seems to have lost touch with reality which could make for some bad, bad parenting decisions. But yes, these celebrity blogs, websites, "news" outlets have been nasty. I saw on one website, a poll that asks "Do you think she'll go out tonight?" I read another article, where the writer called her a gum snappin, panty-less slut.

Wow.

Can Britney ever come back from this......? I mean as a performer? As a mother? As someone who people will root for? By the sounds of the viewing audience, things are looking really bad......understatement of the year.

Xoxo

It's official, people - Britney Spears is making a comeback!

After what was quite possibly the worst-kept secret in VMA history, we finally confirmed Thursday that Britney Spears is going to open the VMAs with her first-ever live performance of her new single "Gimme More." In all honesty, it's not a bad track. Sure, it may not be her best song to date, but it's definately a step in the right direction. My question is this: Is Britney ready for a comeback?

At the moment, Britney is in a child-custody battle with ex-husband Kevin Federline, and there will reportedly be three more court hearings in the dispute this year. One by one, K-Fed has been serving subpoenas to Britney associates including her assistant, former manager and others close to her.

So you would think that with this upcoming drama, the last thing on her mind would be a comeback. But it seems it takes more than a high-profile custody trial to keep Britney down.

Britney has enlisted the help of Criss Angel to put together what is promising to be a spectacular opening performance. She arrives in Vegas tomorrow for rehearsals, and I hope to get the inside track.

For now, take a look at this! Earlier this evening, I went down to the Little White Wedding Chapel, the very place that Britney got married for the first time. I met two newlyweds fresh out of the chapel - let's just hope their marriage lasts a little longer!

Talk tomorrow ...