Baby Spice dressed up as a British Airways staffer and helped customers check in for flights with the airline. Much to the surprise of the passengers, the 41-year-old broke out into song and incorporated dance moves into the process.

She sang portions of memorable Spice Girl hits, including 2 Become 1, Spice Up Your Life, and Wannabe.

Video of Bunton's bizarre behaviour was posted online by charity officials.

Comic Relief's Red Nose Day is part of a global campaign encouraging participants to find creative and humorous ways to raise money for children living in poverty.

Additional airport prank clips, featuring Olympian Tom Daley and comedian and author David Walliams, have also been released ahead of Red Nose Day, which this year falls on 24 March (17) in the U.K.

A telethon marking the charity day will also feature Richard Curtis' short Love Actually sequel, featuring the likes of Liam Neeson, Kate Moss, Hugh Grant, and Martin Freeman.

Ironically, Spice Up Your Life also featured in another online clip earlier on Wednesday, as Bunton's former Spice Girls bandmate Victoria Beckham used the song as the soundtrack for her new Target clothing line ad.