Yes, hem lines continually become shorter as time marches on, but Spring 2010 may be the first season where hem lines can be predominantly measured in negative figures.

Hot pants & boy shorts: women's fashion trend - Women's Wear - Shorts - Trend

Hot Pants

Once upon a time hot pants were considered more suited to a gymnasium than the streets. But then, in late 2007, the leotard came back into fashion. While it didn't peak on the streets until 2009, and was often worn under skirts, shorts or long furs, in the case of Kate Moss, its prevalence guaranteed that hot pants would indeed be worn by forward thinking fashionisers.