Question: On which reality TV Show did Maroon 5's lead singer appear as a judge?

Context paragraphs:
Jeff Wulkan: Jeff Wulkan, (born Jeffrey Michael Wulkan, June 11, 1983, Red Bank, New Jersey), is an American entrepreneur and reality TV star, notable for being the founder and CEO of Bikini Barbers, a hair salon that is known for being 'The Hooters of Hair'.  He is most famous for being the eccentric star of the AXS TV show Bikini Barbershop, which first aired February 19, 2012.  It is a reality TV show set in his salon, Bikini Barbers, and revolves around the, often dysfunctional, day-to-day life of Jeff and the girls he employs.

Heard 'Em Say: "Heard 'Em Say" is a song by American hip-hop artist Kanye West.  It was released on November 8, 2005 as the third single for his second studio album, "Late Registration".  The song features Maroon 5 lead singer Adam Levine, who sings the chorus and bridge.  West co-produced the track with Jon Brion, and it contains excerpts from "Someone That I Used to Love" as performed by Natalie Cole.  The song was met by acclaim from contemporary music critics and is often seen as one of West's best.  The refrain of "Heard 'Em Say" was later recycled for the Maroon 5 song "Nothing Lasts Forever" which appears on their 2007 album "It Won't Be Soon Before Long".

Nigel Barker (photographer): Nigel Barker (born 27 April 1972) is an English reality TV show personality, fashion photographer, author, spokesperson, filmmaker, and former model.  He is best known for his participation as a judge and photographer on the reality show "America's Next Top Model", and is now the host of reality show "The Face".

Adam Levine: Adam Noah Levine (born March 18, 1979) is an American singer, songwriter, multi-instrumentalist, actor, and record producer.  He is the lead singer for the pop rock band Maroon 5.

Hayden Moss: Hayden Garrett Moss (born May 27, 1986), is a reality TV personality from Mesa, Arizona.  He was the winner of the reality TV show "Big Brother 12".  He subsequently competed on "" with his then girlfriend, "" contestant Kat Edorsson; Moss finished the show in 7th place.

Dancing on Ice (Greece): Dancing on Ice is a Greek reality TV show.  The show features celebrities paired with professionals from the world of figure skating.  The show is based on the British show, "Dancing on Ice".  The show has a schedule similar to the reality TV show "Dancing with the Stars" with performance shows on Sundays nights.  Jenny Balatsinou serves as host while Petros Kostopoulos, Elena Paparizou, and Alexis Kostalas serve on the judging panel.  The show premiered on 6 November 2011.

Jennifer Ellison: Jennifer Lesley Ellison (born 30 May 1983) is an English actress, former glamour model, television personality, dancer and singer.  Ellison is perhaps best known for playing Emily Shadwick in the television soap opera "Brookside" until 2003, and as Meg Giry in the 2004 film adaptation of "The Phantom of the Opera".  Ellison also starred on the reality TV show "Dance Mums" the UK version of the American reality TV show, " Dance Moms"

Alex Boylan: Alex Boylan is known as a reality TV contestant, TV show host and producer.  He first came to public attention as part of the winning team together with his friend Chris Luca in the second season of the reality TV show "The Amazing Race" in 2002.  He was later involved in various TV projects such as "Around the World For Free" and "Animal Attractions Television".

She Will Be Loved: "She Will Be Loved" is a song by the American pop rock band Maroon 5.  The song was written by frontman Adam Levine and lead guitarist James Valentine.  It was released as the third single from Maroon 5's debut album, "Songs About Jane" (2002).  The single peaked at No. 5 in the United States, and by December 2012 had sold more than 2,722,000 digital downloads.  It peaked at No. 4 in the United Kingdom.  In Australia, it reached No. 1, a position it held for five non-consecutive weeks.  The single is noted for its music video starring Kelly Preston in a mother-daughter love triangle with lead singer Adam Levine.  The video is also in Sepia.

Casey Weston: Casey Weston (born December 4, 1992) is a singer-songwriter.  She was one of the top two finalists on Adam Levine's team on the first season of "The Voice."  One of her recordings from "The Voice" made number 90 on the "Billboard" Hot 100.

Supporting paragraphs: Casey Weston Adam Levine
Answer: The Voice