Katie Waissel

In week 1 of the live shows, she sang "We Are the Champions". She was put in the bottom three as a result of the public vote, but because Nicolo Festa polled the fewest votes, Waissel had to sing in the final showdown with F.Y.D., the other bottom three act from week 1. She sang "Don't Let Me Down" in the final showdown and was saved from elimination by the judges by a majority vote, with only Cowell (F.Y.D.'s mentor) voting against her while Cole, Dannii Minogue and Louis Walsh voted to save Waissel. Voting statistics revealed that F.Y.D. received more votes than Waissel meaning if Walsh sent the result to deadlock, F.Y.D. would’ve been saved. In the second week of the live shows, Katie sang "I'd Rather Go Blind". She managed to avoid the bottom three this week and secured a place to the third week, where she sang "I Wan'na Be Like You". In the fourth week she sang "Bewitched" and was in the final showdown with Belle Amie. The result went to deadlock this time, but Waissel was announced as safe when it was revealed that Belle Amie had the fewest votes. She was in the final showdown again the next week after performing "Don't Speak" but was saved by a majority vote over Treyc Cohen when Cole refused to vote against either acts of hers but wanted to vote last to send the result to deadlock but wasn't allowed to. Cowell and Walsh voted to eliminate Cohen and only Minogue voted to eliminate Waissel. Voting statistics revealed that Cohen received more votes than Waissel meaning if Cole was allowed to send the result to deadlock, Cohen would have been saved.

In May 2013, Red Velvet released their first song for free download, entitled "I'm Fine", about Waissel's failed marriage to Alphonso, adding a message on her Twitter page thanking her fans for their support. Three more songs, "F*ck You", "High Fashion", and "Say It", were released for free download in June.

Shortly before her elimination, it was revealed Jay-Z had an interest in signing Waissel and fellow X Factor contestant Cher Lloyd to his label, Takeover Roc Nation. These plans did not materialise. On 17 March 2012 Waissel released her self-titled debut album on Chamberlain Records, which consists of recordings from her time on Green Eyed World. The song "The Ugly Truth" was used to promote the album – she performed the song on The Alan Titchmarsh Show, The Late Late Show, and embarked on a short shopping mall tour – although it was not released as a single. In June 2011, Waissel announced she is currently working on another album, and promised it will be a "dirty, sexy, rock 'n' roll" album. In July, she revealed her new band, called "Red Velvet Lovers", and according to Waissel are a "proper band".

Waissel is Jewish. In September 2012, she married male model Brad Alphonso; they divorced after two months of marriage. In 2015, she married comedian Brian Moote; they split in late 2016. In July 2018, she gave birth to her first child, a boy named Hudson. In September 2018 she split from her boyfriend.

In mid-to-late 2009, Waissel starred in an interactive, online reality show Green Eyed World, sponsored by Sprite. The show focused on her journey in the US and Europe in hopes of a record label in 14 episodes of roughly 5 minutes in length each. Sprite experimented with the world's first YouTube/Facebook digital connection.

Katie Waissel (born 24 January 1986) is an English singer-songwriter who came into the public eye when she finished seventh in the seventh series of The X Factor. She is also known for being a housemate in Celebrity Big Brother 18, where she finished in eighth place.

Waissel made two appearances in Vanderpump Rules as herself in Series 4 Episode 1 at Scheana Shay's decade themed 30th birthday party, alongside Kristen Doute. Secondly in Episode 10, where it showed her in her real life role as an office manager of a tattoo removal company in Los Angeles.