Tennis legend, author and champion for social equality Billie Jean King has been cast to play herself on "Ugly Betty." In the episode titled "Curveball," King plays Victoria Hartley's (Christine Baranski) instructor at an exclusive tennis club where Wilhelmina (Vanessa Williams) tries to score match point with the high society matriarch. The episode will air THURSDAY, MAY 21 (8:00-9:00 p.m., ET) on the ABC Television Network.

Joy Behar and Elisabeth Hasselbeck, hosts of the Emmy Award-winning show "The View," moonlight from daytime into primetime when they guest star as themselves on an upcoming episode of "Ugly Betty." When newly crowned media "it" boy, Daniel Meade (Eric Mabius), is invited to appear on "The View" to talk about his stewardship of Mode magazine, little does he know he's about to become the "hot topic." The episode, entitled "Curveball," will air THURSDAY, MAY 21 on the ABC Television Network.

"Ugly Betty" stars America Ferrera as Betty Suarez, Eric Mabius as Daniel Meade, Vanessa Williams as Wilhelmina Slater, Ana Ortiz as Hilda, Tony Plana as Ignacio, Ashley Jensen as Christina, Becki Newton as Amanda, Mark Indelicato as Justin, Michael Urie as Marc and Judith Light as Claire Meade.

Executive producers are Silvio Horta ("Urban Legend"), Academy Award nominee and Emmy Award winner Salma Hayek, Jose Tamez, Richard Heus, Ben Silverman, Teri Weinberg, Tracy Poust and Jon Kinnally. Co-executive producers are Sheila Lawrence, Victor Nelli Jr., Henry Alonso Myers, Bill Wrubel and Chris Black.

"Ugly Betty," a production of ABC Studios, airs Thursdays from 8:00-9:00 p.m. ET, on the ABC Television Network.

Pop singer Adele will guest star as herself and perform on ABC's "Ugly Betty" in May. In the episode, entitled "In the Stars," Adele will perform at a photo shoot which Betty, Marc and Matt produce for a YETI assignment that culminates into a surprise wedding. The sultry soul sensation from the U.K. is now making a name for herself across the pond after winning two Grammys recently for Best New Artist and Best Female Pop Vocal Performance. Poised for superstardom with her hit single "Chasing Pavements," Adele is selling out shows on her current U.S. tour and will co-headline an upcoming concert at the Hollywood Bowl with legendary singer Etta James.