Carlito and Prince Royce
Carlito Olivero and Prince Royce performing on "The X-Factor" finale! FOX

Prince Royce made an appearance during "The X-Factor" finale and performed "Stand By Me" with finalist Carlito Olivero. The "Darte Un Beso" singer had been teasing his performance on the reality competition show earlier in the day in support of Paulina Rubio's boy, Carlito. Earlier in the year, Royce and Rubio shared the judging panel on the Telemundo reality show "La Voz Kids," a Spanish-language children's version of "The Voice." Simon Cowell was pleased with his performance and wrote on Twitter, "Thank you Prince Royce for coming -- you're such a star." To which the Latin superstar replied, "My pleasure sir! Thanks for having me!" WATCH the full performance down below!

Paulina Rubio mentored the boys category this season and has led Carlito Olivero to the finals. Olivero will be facing Jeff Gutt from Kelly's Over 25's category and the duo Alex & Sierra from the Groups category being mentored by Simon. The three remaining acts are all fierce and anybody can take the Sony recording contract that they are vying for. Paulina has been a strong supporter of Carlito and brought her to tears after he performed "Impossible." Rubio feels inspired by Carlito's struggle from moving to Chicago to L.A. in pursuit of a musical career. She see's the passion that drives him and the fight he puts up when he receives negative feedback. Following that performance, Carlito was joined by Prince Royce to sing "Stand By Me" and closed the night singing "Maria Maria." RELATED: Watch Paulina Rubio Perform On 'The X-Factor' Season 3 Finale 'Boys Will Be Boys' And Impress Simon Cowell, Demi Lovato [VIDEO]

Demi Lovato has been confirmed to not be returning to Season 4 of "The X-Factor" on FOX. Simon Cowell made the news official while talking to the press after the musical competition finished airing in the East coast, according to Deadline. Earlier in the day People broke the news that Lovato would be leaving the reality show to focus on her music career, which she had to put on hold to meet the grueling "Factor" schedule. The singer will embark on February on her first arena tour with other "X-Factor" alums like Little Mix, Cher Lloyd and Fifth Harmony. RELATED: 'The X-Factor' USA Season 4 Rumors: Demi Lovato Confirmed By Simon Cowell To Leave After Season 3 Finale The season 3 finale of "The X-Factor" airs tonight (Thursday, 19 December) starting at 8pm ET/PT on FOX.

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