Gabby Douglas made headlines when she became the first African-American woman to win two gold medals during the same Olympic Games. The 16-year-old has been receiving congratulations around the world on the internet, not just from her sports fans but from celebrities as well. Justin Bieber, Lady Gaga, Elizabeth Banks, Nicki Minaj and Pink are just a few of the award-winning recording artists to share how they proud they are of Douglas.