There could be a possible Lady Gaga and Bruno Mars collaboration coming soon, here are all the clues the duo have left for fans to pick up on! ►► Subscribe for more music news: http://blbrd.cm/Proracf ►► See our latest videos: http://blbrd.cm/xOgw6VQ About: Billboard is the world's most influential music media brand, with an unmatched authority among artists, fans and the industry. Billboard powers the ultimate global music destination and magazine, featuring unrivaled reporting on music news,

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