Question: What contestant from Britain's Got Talent was a guest vocalist on Johnny Mathis Christmas album titled Sending you a little Christmas?

Context articles: Christmas Eve with Johnny Mathis
The Christmas Album (Johnny Mathis album)
Sending You a Little Christmas (album)
Gold: A 50th Anniversary Christmas Celebration
Susan Boyle
We Need a Little Christmas (album)
The Complete Christmas Collection 1958–2010
The Classic Christmas Album (Johnny Mathis album)
India's Got Talent
Give Me Your Love for Christmas

Christmas Eve with Johnny Mathis is a Christmas album by American pop singer Johnny Mathis that was released in September 1986 by Columbia Records.
 This was Mathis's fourth holiday-themed LP and focused exclusively on secular material.
The Christmas Album is the fifth Christmas album by American pop singer Johnny Mathis that was released in October 2002 by Columbia Records and included his first recordings of three traditional carols ("Joy To The World", "Away in a Manger", "O Little Town of Bethlehem"), three new songs ("Heavenly Peace", "A Christmas Love Song", "Merry Christmas"), and a handful of 20th-century offerings.
Sending You a Little Christmas is a Christmas album by American pop singer Johnny Mathis that was released on October 29, 2013, by Columbia Records.
 In addition to piano accompaniment on the title track by its composer Jim Brickman, this particular holiday release of original recordings (number six for Mathis) is distinguished by duets with guest vocalists Susan Boyle, Natalie Cole, Gloria Estefan, Vince Gill, Amy Grant, Billy Joel, and The Jordanaires.
Gold: A 50th Anniversary Christmas Celebration is a compilation album by American pop singer Johnny Mathis that was released on September 19, 2006, by Columbia Records and Legacy Recordings.
 It includes selections from four of the first five Christmas albums that he had recorded: "Merry Christmas", "Sounds of Christmas", "Christmas Eve with Johnny Mathis", and "The Christmas Album".
 Two tracks that were recorded with other artists are also included: "O Tannenbaum", which comes from Mannheim Steamroller's 2001 album "Christmas Extraordinaire", and a medley duet of "Winter Wonderland" and "Let It Snow!
 Let It Snow!
 Let It Snow!
" with Bette Midler from her 2006 holiday album "Cool Yule".
Susan Magdalane Boyle (born 1 April 1961) is a Scottish singer who came to international attention when she appeared as a contestant on the TV programme "Britain's Got Talent" on 11 April 2009, singing "I Dreamed a Dream" from "Les Misérables ".
We Need a Little Christmas is a Christmas album by American pop singer Andy Williams that was released by Unison Music in 1995.
 It gives an adult contemporary treatment to songs that Williams had previously recorded for 1963's "The Andy Williams Christmas Album" ("Away In A Manger", "The Christmas Song (Chestnuts Roasting On An Open Fire)", "It's The Most Wonderful Time Of The Year", "Silent Night"), 1965's "Merry Christmas" ("Mary's Little Boy Child"), 1974's "Christmas Present" ("Angels We Have Heard On High", "Hark!
 The Herald Angels Sing", "I Heard the Bells on Christmas Day", "What Child Is This"), and 1990's "I Still Believe in Santa Claus" ("I'll Be Home for Christmas") and includes three songs that Williams had not recorded before.
 In a brief note on the back of the jewel case Williams writes, "These all-new recordings feature fresh, innovative arrangements of some of my favorite carols.
 I felt like I was singing them for the very first time."
The Complete Christmas Collection 1958–2010 is a three-disc box set by American pop singer Johnny Mathis that was released in 2015 by Real Gone Music under license from Columbia Records.
 The set includes Mathis's five holiday albums from the period in their entirety: "Merry Christmas", "Sounds of Christmas", "Give Me Your Love for Christmas", "Christmas Eve with Johnny Mathis", and "The Christmas Album".
 It also compiles all of Mathis's holiday songs that were only released as singles, as well as thematically-appropriate tracks from his non-holiday albums: "When a Child Is Born" from "I Only Have Eyes for You", the holiday version of "What a Wonderful World" from "Let It Be Me", and his two recordings of "Ave Maria" from "Good Night, Dear Lord", which bookend the set.
The Classic Christmas Album is a Christmas compilation album by American pop singer Johnny Mathis that was released on October 7, 2014, by Columbia Records and includes two 1961 recordings that were previously unavailable: "Ol' Kris Kringle" and the original version of the title track from his 1969 Christmas album "Give Me Your Love for Christmas".
 Three other songs ("Christmas in the City of the Angels", "Sign of the Dove" and "The Very First Christmas Day") make their debut on compact disc as of this release, and two other non-album singles ("Christmas Is..." and "My Kind of Christmas") can be counted among the rarities here.
 The collection also includes a selection or two from several of Mathis's Christmas studio albums—"Sleigh Ride" from "Merry Christmas", "Have Yourself a Merry Little Christmas" from "Sounds of Christmas", "Calypso Noel" from "Give Me Your Love for Christmas", "The Christmas Waltz" and "It's Beginning to Look a Lot Like Christmas" from "Christmas Eve with Johnny Mathis", and "Home for the Holidays" from "Sending You a Little Christmas"—as well as his duet with Bette Midler from her 2006 holiday album "Cool Yule", which was a medley of "Winter Wonderland" and "Let It Snow!
 Let It Snow!
 Let It Snow!
".
India's Got Talent (sometimes abbreviated as IGT) is an Indian reality television series on Colors television network, founded by Sakib Zakir Ahmed and part of the global British "Got Talent" franchise.
 It is a cooperative effort between Colors and Britain's FremantleMedia.
 The first episode of "India's Got Talent" premiered on 27 June 2009.
 "India's Got Talent" follows the global "Got Talent" format, in which contestants audition in front of three judges and a studio audience.
 Up until the semifinal and final rounds, the judges decide whether or not a contestant advances in the competition.
 During the semifinal and final rounds, viewers vote on which contestants will advance.
Give Me Your Love for Christmas is the third holiday-themed album by American pop singer Johnny Mathis and was released by Columbia Records on October 13, 1969.
 The oldest song selected for this project was the 1934 classic "Santa Claus Is Coming to Town", which meant there were not the traditional hymns that could be found on his previous Christmas outings.
 He did, however, cover several other contemporary Christmas favorites along with a few new and lesser-known songs, such as the title track, which was a reworking of an unreleased recording of his from 1961, and "Christmas Day", which came from the then-current Broadway musical "Promises, Promises".
 New versions of "Have Yourself a Merry Little Christmas" and "The Little Drummer Boy", which he also recorded in 1963 for his previous Christmas LP, "Sounds of Christmas", made the final track list here as well.