DELUSIONAL RENEE THINKS BETTY IS IN LOVE WITH DANIEL, AND HILDA FACES OFF WITH OLD NEMESIS GINA GAMBARRO, ON ABC'S "UGLY BETTY"

"Project Runway's" Nina Garcia and Christian Siriano Appear as Themselves

"Burning Questions" � An increasingly delusional Renee (guest star Gabrielle Union) becomes convinced that Betty is in love with Daniel and therefore is her rival for his affections. Meanwhile, Hilda's new client at the beauty shop turns out to be ex-neighbor and lifetime nemesis Gina Gambarro (guest star Ava Gaudet), who returns to Queens to rub her fabulous life and wealthy doctor husband in Hilda's face, on "Ugly Betty," THURSDAY, MAY 1 (8:00-9:00 p.m., ET) on the ABC Television Network.

"Project Runway's" Nina Garcia and Christian Siriano appear as themselves.

"Ugly Betty" stars America Ferrera as Betty Suarez, Eric Mabius as Daniel Meade, Tony Plana as Ignacio, Ana Ortiz as Hilda, Ashley Jensen as Christina, Becki Newton as Amanda, Mark Indelicato as Justin, Michael Urie as Marc, Judith Light as Claire Meade, Christopher Gorham as Henry, Rebecca Romijn as Alexis and Vanessa Williams as Wilhelmina Slater. Freddy Rodriguez is a recurring guest star as Gio.

Guest starring are Gabrielle Union as Renee, Nina Garcia as herself, Christian Siriano as himself, Ava Gaudet as Gina Gambarro, Daniel Davis as Dr. Morgan Remus and Jeff Clark as Larry Goldfarb.

"Burning Questions" was written by Henry Alonso Myers and directed by Matt Shakman.

"Ugly Betty" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1-channel surround sound and Spanish audio via SAP. A TV parental guideline will be posted closer to airdate.

This episode of "Ugly Betty" will be available on ABC.com the day after airing on the network for users to watch online.