Production duo The Runners posted a message on Twitter claiming that the 'Impossible' singer featured on the track 'Ay Mama'. Shontelle re-posted the message, adding: "SURPRISE!!!!"
According to the producers - who have worked with artists including Rihanna, Chris Brown and Usher - the single will be released in the US on September 14.
JLS have continued their attempt to crack the US market, despite first single 'Everybody In Love' failing to make a significant impact.
The group's next UK single is reportedly titled ' Love You More'.
Shontelle recently told Digital Spy that she had also been in the recording studio with Rihanna.