Britney Spears Celebrates 30th Birthday a Week Late

"Having an amazing time at the end of my tour," she Tweets from her party in Puerto Rico

Source: http://feeds.people.com/~r/people/headlines/~3/mFotjOifVvY/0,,20552796,00.html

Giulianna Ramirez Grace Park Gretha Cavazzoni Gwen Stefani Halle Berry Hayden Panettiere Haylie Duff