The acts are reportedly all on the guest list for Humes and Wiseman's big day and could make an appearance on stage.
Pixie changes a Lott
Pixie, who turns 21 this Thursday, models herself after pop giant Madonna in her new music video.
The Mama Do singer is famed for her hot pants and wavy blond locks, but she experiments with several new outfits in the video for Kiss The Stars.
The most notable is styled after Madonna's famous 'high ponytail' look from her Blonde Ambition tour in the 1990s.
Speaking on her image, Pixie was reported to have said: 'I’ve never felt any pressure to change the way I look, or to dress more sexily to sell records. In fact, as you can see, I have the opposite problem!'
Kiss The Stars, out on January 29th, is the third single from the star's sophomore album Young, Foolish, Happy.
Pixie Lott, Jessie J and Florence Welch talk exclusively to Heart about their amazing red carpet outfits. Take a listen!
Pixie Lott has revealed that she wants to work with Ed Sheeran and Jessie J.
Singer's new album will be called Young Foolish Happy