Adam Lambert
Adam Lambert, who now tours with Queen, is rumoured to duet with Matt Terry in the X Factor finale Noam Galai/Getty Images

The X Factor 2016 may have found three high-profile pop stars to duet with their three finalists this weekend. The Weeknd, James Arthur and Adam Lambert are reportedly set to sing with contestants Matt Terry, 5 After Midnight and Saara Aalto during the finale at London's Wembley Arena on 11 December.

While X Factor show bosses are yet to confirm the duets, OK! Magazine reports that Starboy hitmaker The Weeknd will team up with boy band 5 After Midnight. Adam Lambert, who has toured with Queen for the past couple of years, is said to be joining forces with Saara Aalto while former X Factor winner James Arthur will sing with Matt Terry.

The news comes days after claims that Stay With Me singer Sam Smith had turned down an invite to duet with Terry. An insider told the Daily Star: "Matt's best performance of the whole series was singing Writing's On The Wall. Sam loved his version so it seemed the perfect plan to put them together. There's still a slim chance but it doesn't look like it will happen now."

Smith, 24, is known to be a fan of Terry's after tweeting a message of support to the finalist earlier in the competition. Reacting to Smith's kind words, Terry previously said: "To sing that song again with Sam Smith would be the dream. It would be such an honour. Sam messaged me afterwards saying it was unreal and how proud he was that I smashed it. To have his support is amazing."

The ITV series have landed some major duets in previous series, with Beyonce delivering a memorable performance with Alexandra Burke of her single Listen, and Michael Buble joining Stacey Solomon for Feeling Good. Others include George Michael duetting with Joe McElderry and Rihanna sharing the stage with Matt Cardle.

The Weeknd
The Weeknd could share the stage with X Factor boy band 5 After Midnight during the finale MARTIN BUREAU/AFP/Getty Images

Burke went head-to-head with JLS when she sang with Beyonce in 2008. JLS singer Aston Merrygold admits the band were "fuming" that Cowell flew the superstar in for Burke while they collaborated with British group Westlife.

Merrygold said during an AOL live-stream: "I was fuming. Listen, Westlife were amazing at the time and we had one of the biggest songs ever, but we were like, 'How's she got Beyonce?' No disrespect to Westlife at all, but we were like, 'Why didn't we get Beyonce?'"

Watch Beyonce duet with Alexandra Burke on The X Factor in 2008: