One day you're in, the next day you're out!Project Runway is back, back, back again this time on a new network, a different lineup of main judges and mentors, and a sickening cast of designers sewing for their lives.The stakes have never been higher, and longtime fans of the show are excited to see how this turns out. Will Project Runway season 21 make it work? Here's everything you need to know about the new season.Where to watch 'Project Runway' season 21 online via streaming or on TV.See on InstagramProject Runway season 21 will air on Freeform, the Disney-owned cable network formerly known as ABC Family. For longtime fans of the series, let's make this clear: Project Runway will not air on Bravo.Beyond Freeform, season 21 will also be available on Disney-owned streaming services such as Hulu and Disney+.Who are the main judges of 'Project Runway' season 21?See on InstagramHeidi Klum is back as the main host of Project Runway season 21. She'll be joined be a panel of judges that includes Nina Garcia and Law Roach.Otherwise, Project Runway winner and fashion superstar Christian Siriano will serve as a mentor for the designer contestants a role assigned to Tim Gunn in past seasons.Who are the guest judges on 'Project Runway' season 21?See on InstagramThis new season of Project Runway on Freeform has a truly star-studded lineup of guest judges. Check out the full list below.Christian CowanHarris ReedJenna LyonsJoan SmallsMichael KorsMickey GuytonNikki GlaserSara FosterSofia VergaraTyra BanksZac PosenMeet the designer contestants on 'Project Runway' season 21.See on InstagramThe Project Runway season 21 cast features 12 designers. Between contestants from past seasons returning for another chance, siblings competing against each other, and a fierce RuPaul's Drag Race alum, the girls, gays, and theys are gagging for this cast.Keep scrolling to learn more about the Project Runway season 21 designers and tune into this new season when premieres on Thursday, July 31 with a special two-episode premiere at 9 p.m. ET on Freeform, and available to stream on Hulu and Disney+.Alex FoxworthGrowing up in Greensboro, NC, sharp and opinionated designer, Alex Foxworth, is the juxtaposition of Southerner meets New Yorker. Inspired by her Japanese grandmother from Nagasaki, she incorporates traditional kimono techniques into timeless, mindful designs.Angelo RosaA proud single dad and passionate streetwear designer from Providence, RI, Angelo Rosa fuses his Dominican heritage with his New York grit. His designs blend luxury streetwear with bold, edgy details that reflect his creativity and resilience.Antonio EstradaAfter designing alongside his twin, Jesus Estrada, Antonio Estrada is ready to own his voice as a designer and put the spotlight on his own intuitive couture. Born in Mexico and raised in California, Antonio is a self-taught designer known for his bold, versatile designs that blend glamour with a touch of playful rebellion.Belania DaleyKnown for her fearless and feisty personality, Belania Daley, elevated streetwear designer, is ready to put her signature pattern-mixing and color-blocking designs into the spotlight. Growing up on Long Island, Belania learned how to sew at the age of 13 and has since honed impressive technical skills.Caycee BlackProject Runway season 19 alum and Houston, TX native Caycee Black, returns and is bringing her out-of-this-world designs back to the runway. Caycee is known for her hand-painted prints, gender fluid designs, and love for breaking traditions in the chicest way possible.Ethan Mundt, a.k.a. Utica QueenOtherwise known as RuPaul's Drag Race season 13 star Utica Queen, Ethan Mundt is now bringing his fierce fusion of high fashion, avant-garde artistry, and theatrical storytelling to Project Runway. He aims to bring drama, sophistication, and a touch of surrealism to everything he creates.Jesus EstradaProject Runway season 7 alum, Jesus Estrada, is back, alongside his twin brother Antonio, to reclaim his narrative and show the world the designer he's become. Born in Mexico and raised in California, Jesus Estrada is a charismatic designer known for vibrant queer designs that blend old Hollywood Glamour with a modern edge.Joan MadisonA vibrant and high-energy designer from Queens, NY, Joan Madison brings optimism, creativity and bling to everything she touches. Known for her big, dramatic designs and theatrical style, she's ready to make her dreams come true.Joseph McRaeCharlotte, NC native Joseph McRae is a self-taught designer and electrical engineer known for his southern charm and sass. After leaving his 13-year job, Joseph is now betting on himself and bringing his bold, boundary-breaking designs to the runway.Madeline MalenfantVintage and period-piece obsessed designer, Madeline Malenfant, grew up on Nantucket and always dreamt of being a fashion designer. Deeply inspired by the Renaissance period, her unique historical design style blends era-esque silhouettes with a modern twist.Veejay FlorescaA fearless designer and proud trans woman from the Philippines, Veejay Floresca is known for her fiercely competitive and unapologetic personality along with her aesthetic that combines modernity, wearability, and art.Yuchen HanOriginally from Xining, China, Yuchen Han is an ambitious and authentic designer on a personal mission to empower others through his futuristic and enlightenment-focused designs. Often finding inspiration from sci-fi films, Yuchen is obsessed with Aliens and fiercely owns who he is.Watch: Cast announcement for 'Project Runway' season 21