Christmas came a little bit early for Little Mix fans in London. On Saturday night (December 6), the pop quartet not only shared their new song, "Secret Love Song," but they also performed with a special guest, Jason Derulo.

Midway through their set, the ladies introduced the new song and slowed things down a bit. They sing about a relationship that might be great but is still on the down low. After the first verse and Perri Edwards' powerful delivery on the chorus, the group brings Jason out who shows just as much as emotion as they did.

"Why can't you hold me in the street / Why can't you kiss me on the dancefloor / I wish that it could be like that / Why can't it be like that / 'Cause I'm yours," he and Perri belt on the chorus at the O2 Arena.

 See the full performance below.