Adriana Diaz

For the first challenge, Rihanna tasks the designers with creating designs inspired by their favorite music artists. While some designers thrive with the creative freedom, others struggle to keep up with their first celebrity design challenge. The mentors are Pharrell Williams, Erin Wasson and Mel Ottenberg.

The designers create "off-duty" rock star looks for singer Carly Rae Jepsen; the winning look will be in a Glamour.com feature.

The cast creates looks inspired by old Hollywood glamour for Khloé Kardashian to wear at a Grammy Awards after-party. Recording artist Ne-Yo is guest mentor.

The remaining four designers must create complementary looks for power couple Naya Rivera and Big Sean for his record release party.

The designers are challenged to pitch and design a futuristic piece for pop icon Kylie Minogue to wear at the launch party for her new fashion retrospective book. The cast is shaken up when they are forced to rethink their concepts at the 11th hour. Along with the mentors, designer Jeremy Scott helps Kylie choose the winning look.

The designers create a sexy club look for Miley Cyrus; Miley's mom scrutinizes the outfits.