Each and every year, the who’s who of young Hollywood attends, and on Thursday night (September 27) the 10th Annual Teen Vogue Young Hollywood Party was nothing short of a star-studded event.

Stepping out for an eccentric night of fun, celebrities of all sorts spent Saturday night (March 24) out at Perez Hilton’s Mad Hatter Tea Party birthday celebration.

The fun and crazy event, which was held at Siren Studios in Hollywood, CA, had A-listers like Kim Kardashian and Ashley Tisdale sporting their not so usual style in eye popping hats and outfits.

Every year, the who’s who of young Hollywood attends, and on Friday night (September 23) the 9th Annual Teen Vogue Young Hollywood Party was nothing short of a star-studded event.

The party took place at Paramount Studios in Hollywood, drawing out stars such as "90210" actress Shenae Grimes and "True Grit" cutie Hailee Steinfeld.