By Missy Schwartz
Updated August 21, 2009 at 07:14 PM EDT

The Lifetime-Project Runway marriage is off to a promising start. According to Nielsen Research, last night’s premiere of the sixth season earned a 3.3 rating in households (a 32% increase from the season five premiere on Bravo) and a 3.2 rating among women 18-29 (a 28% increase). With an average of 4.2 million total viewers, it was the highest-rated premiere for both Runway and the 25-year-old Lifetime. It was also was the highest-rated premiere for a cable competition reality series this year.

Meanwhile, Runway’s new spinoff, Models of the Runway, premiered to a 1.4 rating among women 18-49 and a 1.6 household rating for an average of 1.9 million total viewers. The two-hour special Project Runway: All-Star Challenge, which kicked off the Runway-themed night, secured a 2.2 rating with women 18-49 and a 2.3 household rating. It averaged 2.9 million total viewers.