The stars of the music world were out last night (December 6) for the 2008 KIIS FM Jingle Ball at the Honda Center in Anaheim, California.

With most of the acts performing short 15 minute sets in promotion of the Clear Channel radio station, Katy Perry dazzled in a Santa Claus outfit as she performed her hit song "I Kissed A Girl" for a packed house of screaming fans.

Joining in on the Hollywood Halloween revelry, Christina Milian was on-hand at the Pur Jeans Halloween Bash held at STK last night (October 31).

The "AM to PM" singer showed off her fine figure in a ladybug costume as she mingled with a guest list including Lauren Conrad, Kim Kardashian and Caroline D'Amore.

While the major festivities don’t get underway until this Sunday evening, the 2008 MTV Movie Awards pre-parties have already started out in Los Angeles, California.

On Thursday afternoon, stars including Christina Milian and Shannon Elizabeth were among those in attendance at the always-popular Kari Feinstein MTV Movie Awards Style Lounge.