We were already looking forward to seeing eight fan favorites (including Santino Rice!) return to the sewing machine for "Project Runway All-Star Challenge," airing tomorrow (Aug. 20), but Lifetime is going all-out for its newly acquired show.

The Network confirmed to StyleList that A-lister Nicole Kidman will be making a cameo appearance on the two-hour special, helping set up a challenge for the designers.

While "Project Runway" is no stranger to celebrities -- Sarah Jessica Parker challenged Season 4 contestants to create a two-piece look for her Bitten line with just $15 -- Kidman isn't someone we'd expect to see on reality TV.

The actress, with her model-like frame and often criticized cold persona, is better known for Chanel ad campaigns and donning haute couture than for catering to the masses.

Since the show's clearly upping the ante, rather than being given a mere $15 to work with, we're hoping the "Project Runway" designers will have a chance to whip up something appropriately high-end and glamorous, like Kidman's open back gown (above).

We'll have to tune in tomorrow to see!

For info on the new crop of "Project Runway" contestants, click here.