Question: What was the alias of the member of the Spice Girls who was the subject of the song "Me Plus One"?
Context: Geraldine Estelle "Geri" Horner (née Halliwell; born 6 August 1972) is an English pop singer-songwriter, clothes designer, author and actress.  Halliwell came to international prominence in the 1990s as Ginger Spice, a member of the successful girl group the Spice Girls; together they sold over 85 million records worldwide, making them the best selling girl group of all time.  In 1998 Halliwell left the Spice Girls, though she rejoined the group when they reunited in 2007.  Halliwell reportedly amassed a $40 million fortune during her last two years in the group. "Mama" is a song by the British girl group the Spice Girls.  It was written by the Spice Girls, Matt Rowe and Richard Stannard, and produced by Rowe and Stannard for the group's debut album "Spice", released in November 1996.  "Mama" is a pop ballad that features instrumentation from keyboards, a rhythm guitar, a cello, and a violin, and its lyrics deal with the difficulties in relationships between mothers and daughters that appear during adolescence. "Me Plus One" is a song by Norwegian singer and songwriter Annie from her debut studio album, "Anniemal" (2004).  It was written by Richard X and Hannah Robinson, and released as a promotional single.  The song was written about former Spice Girls member Geri Halliwell.  The lyrics refer to a "wannabe señorita" who needs to realise she has "got to let it go".  The song received acclaim from music critics. Period Pains were a British all-female indie punk band formed in 1996.  They achieved notoriety in 1997 after releasing the single "Spice Girls (Who Do You Think You Are?)" , a play on the Spice Girls single title.  The track was an attack on what they saw as the Spice Girls' shallow attitudes, and was heavily plugged by John Peel and Steve Lamacq on BBC Radio 1.  The UK's tabloid newspapers also picked up on the band As a result, it made the UK Singles Chart with practically no advertising, and reached No.4 in Peel's annual end-of-year Festive Fifty.  They then recorded a session for Peel, which was released as an EP. Victoria Caroline Beckham, {'1': ", '2': ", '3': ", '4': "} (née Adams; born 17 April 1974) is an English businesswoman, fashion designer, model, and singer.  In the late 1990s, Beckham rose to fame with the all-female pop group Spice Girls, and was dubbed Posh Spice by the July 1996 issue of the British music magazine "Top of the Pops".  After the Spice Girls split, she was signed to Virgin Records and Telstar Records and had four UK Top 10 singles.  Her first release, "Out of Your Mind", reached #2 in the UK Singles Chart. "Say You'll Be There" is a song by English girl group the Spice Girls from their debut studio album, "Spice" (1996).  It was co-written by the Spice Girls with Eliot Kennedy.  Production duo Absolute incorporated a mix of pop and R&B into the song, which includes a harmonica solo, played by Judd Lander.  The lyrics—which describe the things the group went through together and how they were always there for each other—received mixed reviews from critics, who described them as "confusing" and felt that the R&B-infused production was a "bid for street cred".  The song has also been covered by Danish singer-songwriter MØ which also gained popularity. The Spice Girls were an English pop girl group formed in 1994.  The group originally consisted of Melanie Brown ("Scary Spice"), Melanie Chisholm ("Sporty Spice"), Emma Bunton ("Baby Spice"), Geri Halliwell ("Ginger Spice"), and Victoria Beckham, née Adams ("Posh Spice").  They were signed to Virgin Records and released their debut single "Wannabe" in 1996, which hit number one in 37 countries and established them as a global phenomenon.  Their debut album "Spice" sold more than 31 million copies worldwide, becoming the best-selling album by a female group in history.  Their follow-up album "Spiceworld" sold over 20 million copies worldwide.  The Spice Girls have sold 85 million records worldwide, making them the best-selling female group of all time, one of the best-selling pop groups of all time, and the biggest British pop phenomenon since Beatlemania.  Among the highest profile acts in 1990s British popular culture, "Time" called them "arguably the most recognisable face" of Cool Britannia, the mid-1990s celebration of youth culture in the UK. "Goodbye" is a song recorded by British girl group Spice Girls.  It was written by the Spice Girls, Richard Stannard and Matt Rowe, while it was produced by the latter two.  The song became the group's first song without the vocals of Geri Halliwell.  It was released by Virgin Records on 14 December 1998 as a Christmas single, along with the B-side, "Christmas Wrapping".  The song was composed by Richard Stannard and Matt Rowe along with the remaining Spice Girls.  It was later included as the eleventh and final track on their third studio album "Forever". "Holler" is a song by English girl group the Spice Girls, released as one of the two songs picked as the lead single from their third studio album, "Forever" (2000).  The song was written by the Spice Girls, Rodney Jerkins, LaShawn Daniels and Fred Jerkins III, with Jerkins also producing it.  The single was released as a double A-side single along with "Let Love Lead the Way" internationally, on 23 October 2000, except within the United States and Canada. The Spice Girls were an English pop girl group that first came to international prominence with the release of their chart-topping debut single "Wannabe" in 1996.  In 1997, the band became involved in an unprecedented marketing phenomenon, leading to a prolific number of Spice Girls merchandise and sponsorship deals.  With the official Spice Girls branding on hundreds of different products, they became the most merchandised group in music history.  The Spice Girls brand reportedly produced over £300 million worldwide through merchandise in 1997.  Globally, the group's total grosses were estimated to have been $500–800 million by May 1998.
Answer: Ginger Spice