http://www.popeater.com/celebrities/vanessa-hudgens/" target="_blank didn't seem too upset about her http://ttp//www.popeater.com/2010/12/13/zac-efron-vanessa-hudgens-breakup/, partying the night away in Las Vegas to celebrate her 22nd birthday on Saturday. The actress sported a tight minidress for a special dinner at Social House and bash at Pure, which lasted late into the night.


Close friends Ashley Tisdale and Brittany Snow partied with her.


Hudgens danced the night away, before heading back to the Emperor's Suite -- where the boys of 'Hangover' stayed in 2009's hilarious hit film -- shortly after 1AM.


Last week, she and http://www.popeater.com/celebrities/zac-efron/" target="_blank ended their four-year relationship. A source tells http://www.gossipcop.com/zac-efron-vanessa-hudgens-break-up-split/" target="_blank that the split was "amicable," after the stars recognized that their relationship "wasn't going to go further."

The couple met while filming the first installment of Disney's mega-hit 'High School Musical' franchise and began their romance shortly after. "It's nothing dramatic," a source told http://www.eonline.com/uberblog/marc_malkin/b215915_zac_efron_vanessa_hudgens_split.html's Marc Malkin, who broke news of the split. "There's no third party involved."