Mel - full name Melanie Brown - uploaded the photo to Twitter yesterday (27 June) as part of the social networking site's 'Throwback Thursday' trend.
In the snap, Mel is wearing a snazzy striped cropped top with matching skirt, while Victoria is dressed in a low-cut white dress with thin straps.
But unfortunately, as it is an 'old school' print which Mel B has coped with a digital camera, the flash has caught Victoria bang on her left boob. Oops!
Alongside the picture, Mel tweeted: "Throwback Thurs, Vic's boob is lighting up the pic hahaha 'bright light bright light'!"
We're sure Victoria's going to be delighted when she sees this photo, Mel!