Miley Cyrus, Katy Perry and Adam Lambert were all in attendance at Britney Spears' opening in Las Vegas at Planet Hollywood this past Friday night.  Eyes and cameras were on Cyrus as she goes crazy for Britney in the front row.

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Louisiana native Britney Spears opened to a packed house at Planet Hollywood in Vegas for the first of 100 shows.  The 90 minute show included 23 songs, 2 wigs and 7 costume changes.

Spears looked good but a bit "stiff" and already people are saying she didn't sing a lick.  Fans, however, are quick to point out that she does sing, her actual voice is just very low while the track being played is much louder.

No matter what Britney Spears does on stage, good or bad, lip-syncing or live, one cannot argue that she is still a draw.  Ticket sales are very very good.  Spears says this will be her last long term appearance in Vegas.

Miley Cyrus At Britney Spears' Vegas Opener