Selena Gomez on the HSM3 Red Carpet

Out supporting her fellow Disney stars, Selena Gomez made a grand arrival for the premiere of the "High School Musical 3: Senior Year" at the Galen Center in Los Angeles on Thursday evening (October 16).

Wearing a white halter-style dress, the "Wizards of Waverly Place" starlet smilingly posed for photographers before moving along to mingle with fellow event attendees.

In high demand as her stardom rises, Selena has also just recently been appointed as a spokesperson for children's charity UNICEF's 2008 Trick-or-Treat campaign.

"I am extremely excited to be this year's Trick-or-Treat for UNICEF spokesperson. I want to help encourage other kids to make a difference in the world and show them that Trick-or-Treat for UNICEF is such a great, fun way to get involved," Miss Gomez tells.

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To see the entire gallery from the Los Angeles premiere of “High School Musical 3” (October 16) - Click Here!