Girls Aloud singer Kimberley, who is expecting her first baby with long-term boyfriend Justin Scott, was pictured earlier today during a studio break.
Looking effortlessly glam, the expectant mum covered her tiny baby bump with a pair of leather trousers and a black jumper, completing her look with a slick of bright red lipstick.
Kimberley, 32, also appeared to be warming up the vocal chords by sipping on a mug of hot water and lemon.
Sport Relief tweeted a snap of Kimberley at the recording, telling followers: "The cast list for this amazing #srworldcup song is growing... @KimberleyJWalsh."
The charity also shared another picture of Kimbers alongside former Spice Girl Emma Bunton. The caption read: "Not everyday you see @KimberleyJWalsh & @EmmaBunton being photo bombed by Gary Mabutt. #srworldcup."
The Sport Relief official England 2014 FIFA World Cup charity single is the brainchild of Take That star Gary Barlow and former England footballer Gary Lineker.
The video will be shown in full on the Sport Relief Night of TV on Friday 21 March. The single, however, won't be released until nearer the 2014 FIFA World Cup.
Celebrities send their congratulations to Kimberley and Justin: