Hilton: "I'm too tired to go out"

Reknowned socialite Paris Hilton has blamed a heavy work schedule for her lack of partying of late.

The Simple Life star is currently working on a number of new projects, including filming a horror movie, creating her own perfume, launching a chain of 'Paris' nightclubs and - gasp - recording an album.

"I don't go out as much any more because I'm too tired to," Hilton told The Late Show. "I have to get up at, like, 5am - and that's when I used to stay out until."

Her relentless daily grind also excludes a love life, although she admits to being more mellowed in her pursuit for Mr. Right. "I used to date really big losers and mean guys," she added. "Now I've matured a lot, I just want someone who's sweet and loyal. Just someone who treats me well - it doesn't matter about looks any more."