Madox is a young Polish singer, who apparently performed in a televised singing competition along the lines of "Got Talent." Madox has a feminine voice, a lean build, and a clear interest in the feminine world. Sounds perfect for the Cover Gurlz.
Here's a video of Madox singing "On and On" in English, though it is easy to find other English language songs too. This one is not in HD, but it's not bad:
For an interesting pictorial spread, see this "Bridgitte Bardot" spread.
This is the video for "High on You."
high on you - MADOX - music video from IMAGA on Vimeo.