Lauren Conrad's Clothing Success

Lauren Conrad (in BCBG Maz Azria) hosts a party at Christian Audigier The Nightclub inside Treasure Island Resort Hotel Casino in Las Vegas, Nevada, on Saturday.

The Hills star hosted the party to celebrate the success of her clothing line.

The 22-year-old has been tapped to design a couture gown for the 60th Primetime Emmy Awards trophy girls who hand out U.S. television’s top honors. “I will be doing a red carpet look that still reflects the simple classic design of the Lauren Conrad Collection but with a black tie twist,” she said in a statement.

Lauren returns for the fourth season of The Hills, premiering Monday, August 18 at 10 p.m. on MTV.

20+ more pics inside of Lauren Conrad‘s clothing success…