Sunday night marked the end of Britney's North American Tour, The Circus Starring Britney Spears. Check out this final round of photos from the second night in Las Vegas, which includes lots of lovely shots of a smiling Britney!

Congratulations to Britney and the rest of the Circus cast and crew for a truly amazing tour!

Photos by Roderick Norman Trestrail II.

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Britney's brand new single, 3, has just premiered!  You can listen to it here:

/>Can't get enough? The single will be released on iTunes on October 6th, but more importantly, start requesting 3 at your local radio stations via email and phone please!

What do you think? Post your reviews in the comments and we'll post the best of your reviews.

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1, 2, 3
Not only you and me
Got one eighty degrees
And I'm caught in between
Countin'
1, 2, 3
Peter, Paul & Mary
Gettin' down with 3P
Everybody loves ***
Countin'

Babe, pick a night
To come out and play
If it's alright
What do you say?

Merrier the more
Triple fun that way
Twister on the floor
What do you say?

Are - you in
Livin' in sin is the new thing (yeah)
Are - you in
I am countin'!

1, 2, 3
Not only you and me
Got one eighty degrees
And I'm caught in between
Countin'
1, 2, 3
Peter, Paul & Mary
Gettin' down with 3P
Everybody loves ***
Countin'

Three is a charm
Two is not the same
I don't see the harm
So are you game?

Lets' make a team
Make 'em say my name
Lovin' the extreme
Now are you game?

Are - you in
Livin' in sin is the new thing
Are - you in
I am countin'!

1, 2, 3
Not only you and me
Got one eighty degrees
And I'm caught in between
Countin'
1, 2, 3
Peter, Paul & Mary
Gettin' down with 3P
Everybody loves ***

What we do is innocent
Just for fun and nothin' meant
If you don't like the company
Let's just do it you and me
You and me...
Or three....
Or four....
- On the floor!

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Britney's new single, '3' will premiere tomorrow morning on Z100, so wake up early to hear it first.

And here's the cover art for '3':

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My good friend Lance surprised me on stage last night for Breathe On Me.  It was soooo funny!  Good to see you Lance!  - Britney

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@MileyCyrus Thanks for coming to my show last night! Hope you had fun! - Britney

The last hoorah!!! Vegas 2....Goodbye North America!, hello Australia. -Adam, manager

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