After taking her tour around the world, Britney Spears wrapped up the elaborate [article id="1674256"]Femme Fatale trek[/article] on Saturday in Puerto Rico.

But before she took the stage, [article id="1675328"]Spears celebrated[/article] her big 3-0 with a party on Friday night. The belated birthday bash took place a week after her December 2 birthday. The pop star tweeted all about the party, giving fans a picture of her blowing out the candles on her elaborate, multitiered birthday cake.

"Having an amazing time at my end of tour/ belated bday party!" she wrote on Twitter on Saturday. "Thx so much to the Conrad Condado Plaza for giving us a place to celebrate this tour & my 30th bday last night - we all loved the party!"

But the fun hardly ended with the party. For her final performance of the Femme Fatale shows the following day, Spears was joined by some of her family and friends onstage.

"That's a wrap! The Femme Fatale tour is officially over :( Gotta give some end of tour shout outs," she tweeted, before showing some online love to her pals. "To [my assistant] Brett [Miller] and her fierce dance moves! She surprised me on stage tonight during 'Big Fat Bass.'

To all my dancers - u all are basically family. Thx so much for an unforgettable year! Look at this good looking group. To every single INCREDIBLE person on my crew - none of this would of been possible without you. I'm gonna miss u!"

Britney saved her ultimate Twitter thank-you for all her devotees. "And last but DEFINITELY not least - to all of the amazing fans who I saw on this journey around the world," she wrote. "<3 u all."

For the final bow of the tour, Spears was joined by her sons, Sean Preston and Jayden, her beau Jason Trawick, sister Jamie Lynn and JL's daughter, Maddie, as she said goodbye to life as a femme fatale,

href="http://www.radaronline.com/exclusives/2011/12/britney-spears-femme-fatale-tour-ends-pauly-d-and-family-stage-photos"

target="_blank">Radaronline.com reports.

In addition to all the stage love from those closest to her, Spears was also joined by San Juan [article id="1675665"]tour opener Pauly D[/article]. She thanked him by giving him one of her signature mid-show lap dances during "Lace and Leather." It wasn't the first time for the tourmates: Spears had awarded him one once before when he opened for her on a number of dates on a previous leg of the tour.