The Little Mix star plays a pop star named Georgia who reunited with her ex, and fans think they were teased with not one but two original tracks recorded by Leigh-Anne for the film.
In one scene Leigh-Anne takes to the stage alone at London’s Omera jazz cafe where she performs on her own, while a brand new song can be heard in a different scene where the characters tuning in as Georgia's original song is announced as the Christmas number one.
Fans are thirsty to hear the track in the full, one Twitter user said: "So are there any updates on the boxing day soundtrack i'm in desperate need of leigh-anne solo."
While another fan theorised Leigh-Anne wrote the songs herself, "leigh anne killed her part in boxing day, her solo songs sounded insane and she wrote them!!"
A third person hailed the songs "so good" and said they need them ASAP. "Ugh i love leigh-anne’s voice so much," they added.
Tyla has contacted Leigh-Anne's representatives for comment.
Leigh-Anne spoke with Tyla about performing on stage for the first time in 10 years for Boxing Day.
“It was really strange being on that stage in jazz café scene. I haven't sung on my own for like 10 years. So, that was like petrifying," she said.
“But I think it's also nice because I think people finally get to really hear me sing. And I don't think a lot of people have really heard me sing like that. Especially when you're in a group.”
On Thursday Little Mix announced they would go on hiatus after their 2022 Confetti tour next spring.
Boxing Day is in cinemas now.