The Project Runway contestants have a big challenge on Thursday night’s episode – they have to create an unconventional wedding dress.

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“This week on #ProjectRunway, we take a walk down the aisle and you better say #IDo,” the show’s Twitter page wrote on Monday.

And, it seems the elimination this week may be more suprising than the departure of Mitchell Perry and Kristine Guico last Thursday.

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“If you thought last week's double elimination was shocking, just wait until Thursday night,” Project Runway also tweeted.

Burlesque dancer and model Dita Von Teese and fashion blogger Chiara Ferragni will also join in on the intense competition. The two ladies will join Heidi Klum, Nina Garcia and Tim Gunn as the guest judges.

"Are you ready? Watch me as a gues[t] judge on @projectrunway this Thursday night," Ferragni tweeted along with the hashtags, "#theblondesaladneverstops #chiaraxprojectrunway."

Tune in to the new episode of Project Runway on Thursday night at 9/8c on Lifetime.