With hundreds of fans lining both sides of Hollywood Boulevard, Britney absolutely stunned reporters and fans alike on the blue carpet during The X Factor screening and kick-off party last night at Grauman's Chinese Theater in Los Angeles! She looked gorgeous in a cobalt blue Stella McCartney dress and Gucci peep-toe platforms — and the photos do not do her justice. Britney. Was. Flawless. After rocking the blue carpet, Brit Brit joined her fellow judges for a hand-print ceremony where her hands will be forever immortalized alongside the likes of Marilyn Monroe and Bette Davis. Some of the highlights:

We're here at the Grauman's Chinese Theatre for the #XFACTOR premier! Check out the blue carpet! twitter.com/ItsBritney/sta…

— Britney Spears App! (@ItsBritney) September 11, 2012

Pre-handprint ceremony at Grauman's Chinese Theater! #xfactor twitter.com/RealBRITannica…

— Britney.com (@RealBRITannica) September 12, 2012

I love me some hardcore @britneyspears and @thexfactorusa fans! Just heard someone blasting #TillTheWorldEnds, too... twitter.com/RealBRITannica…

— Britney.com (@RealBRITannica) September 12, 2012

I'm here!!! Just walked the blue carpet for the #XFactorParty - so exciting! twitter.com/britneyspears/…

— Britney Spears (@britneyspears) September 12, 2012

How flawless is @britneyspears? #stunning #XFactor #ItsBritney twitter.com/RealBRITannica…

— Britney.com (@RealBRITannica) September 12, 2012

Awh, @ddlovato and @simoncowell look gorgeous, too! #XFactor twitter.com/RealBRITannica…

— Britney.com (@RealBRITannica) September 12, 2012

The Queen has arrived! She's signing autographs for fans. Here we go! twitter.com/ItsBritney/sta…

— Britney Spears App! (@ItsBritney) September 12, 2012

History is made! The judges just put their hands in the cement! #xfactorparty twitter.com/TheXFactorUSA/…

— THE X FACTOR (USA) (@TheXFactorUSA) September 12, 2012

The fans outside are having a chanting war! @britneyspears vs. @ddlovato #ItsBritney

— Britney.com (@RealBRITannica) September 12, 2012

And we're in! So psyched to see the premiere of @thexfactorusa... y'all better watch tomorrow at 8/7c xx twitter.com/RealBRITannica…

— Britney.com (@RealBRITannica) September 12, 2012

As for The X Factor premiere itself, words can't describe! OK, OK... I'll try. Hilarious. Emotional. INSPIRING. I laughed. I cried. I can't wait for y'all to see it tonight, and I'm beyond excited for the rest of the season!

HA! @britneyspears' one-liners on @thexfactorusa are classic. #ItsBritneyBitch #XFactorParty

— Britney.com (@RealBRITannica) September 12, 2012

I definitely just shed a tear or five during the @thexfactorusa screening. #goodstuff #XFactorParty

— Britney.com (@RealBRITannica) September 12, 2012

Ahh! This episode has all of our emotions coming out. Now it's giving us chills! #xfactorparty

— THE X FACTOR (USA) (@TheXFactorUSA) September 12, 2012

"I know what it feels like to want something so bad." - @britneyspearssays she can relate to @thexfactorusa contestants

— Britney.com (@RealBRITannica) September 12, 2012

Here's Britney at the Q&A! twitter.com/ItsBritney/sta…

— Britney Spears App! (@ItsBritney) September 12, 2012

So amazing to see @thexfactorusa episode for the 1st time tonight - wow! I think u all are in for a treat. Premiere is tmrw... ready people?

— Britney Spears (@britneyspears) September 12, 2012

Photos via Wire. Watch the two-night premiere of The X Factor TONIGHT and TOMORROW at 8/7c on FOX.

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