Question: Who is a pornographic actress and a mentor/judge on the online reality TV series The Sex Factor?

Context paragraphs:
The X Factor (UK series 6): The X Factor is a British television music competition to find new singing talent.  The sixth series started on ITV on 22 August 2009 and was won by Joe McElderry on 13 December 2009.  Cheryl Cole emerged as the winning mentor for the second consecutive year, the first time in the show's history that a mentor has won back-to-back series.  The show was presented by Dermot O'Leary, with spin-off show "The Xtra Factor" presented by Holly Willoughby on ITV2.  McElderry's winner's single was a cover version of Miley Cyrus's "The Climb".  Public auditions by aspiring singers began in June 2009 and were held in five cities across the UK.  Simon Cowell, Louis Walsh, Minogue and Cole returned as judges.  This season was the first to be sponsored by Talktalk after they took over the sponsorship from The Carphone Warehouse.  For the first time, auditions were held in front of a live audience.  Following initial auditions, the "bootcamp" stage took place in August 2009, where the number of contestants was narrowed down to 24.  The 24 contestants were split into their categories, Boys, Girls, Over 25s and Groups, and given a judge to mentor them at the "judges' houses" stage and throughout the finals.

Mary Carey (actress): Mary Carey (born June 15, 1980) is an American pornographic actress and film director known for her appearance on the VH1 reality TV series "Celebrity Rehab".

Jessica Hall (American actress): Jessica Danielle Hall (born June 21, 1983) is an American actress, model, reality TV and radio personality who appears in the reality television show series "Kendra" on E!.  She is the older sister of fellow reality TV personality Stacie Hall from MTV reality television series "The Hills".

The Sex Factor: The Sex Factor is an online reality TV series produced by xHamster where eight men and eight women compete to become a porn star.  The sixteen contestants supposedly have never had sex on camera prior to the series.  The show stars Asa Akira as the host, and also features Lexi Belle, Tori Black, Remy LaCroix, and Keiran Lee as mentors and judges.  Belle Knox was initially going to host the show, but was replaced by Akira.

Rosemary Shrager: Rosemary Jacqueline Shrager (born 21 January 1951) is a British chef, best known for being an haute cuisine teacher on the reality television programme "Ladette to Lady", and as a judge on "Soapstar Superchef".  She also made an appearance on the reality TV series "I'm A Celebrity... Get Me Out Of Here! ".  Other television projects have included "Kitchen Showdown with Rosemary Shrager", where she weaned unhealthy fast-food families onto nutritious cuisine.  Shrager is an accomplished chef and has worked with fellow "Soapstar Superchef" judge Jean-Christophe Novelli.

Pravesh Rana: Pravesh Rana (born February 26, 1983) is a male model and Mr. India 2008, and a reality TV show personality.  In 2009, he participated as a wild card entry in the reality TV series, "Bigg Boss 3"

Trishelle Cannatella: Trishelle Cannatella (born November 4, 1979) is an American reality TV contestant, "Playboy" model, and actress, known for her appearances on the MTV reality television series "", and the "Real World" spinoff show "The Challenge".  She has also appeared on other reality shows such as "The Surreal Life", "Kill Reality", "Punk'd" and "Fear Factor".  She has also made appearances in TV ads and music videos, posed nude in "Playboy" magazine, appeared in the horror film "The Scorned", and competed successfully in celebrity poker tournaments.

Mari Possa: Mari Possa (born January 21, 1980) is a pornographic actress and reality TV personality.

Lexi Belle: Lexi Belle (born August 5, 1987) is the stage name of an American pornographic actress.

Blair McDonough: Blair McDonough (born 30 April 1981, in Melbourne, Victoria, Australia) is an actor who is best known for playing the role of Stuart Parker in the Australian TV soap opera "Neighbours".  He first shot to fame the age of 19 in 2001, when he finished runner-up in the inaugural season of the reality TV series "Big Brother".  He has since appeared on a number of other reality TV shows.

Supporting paragraphs: The Sex Factor Lexi Belle
Answer: Lexi Belle