Looks like Selena Gomez truly is taking her power back. The 21-year-old pop star just returned from her trip to Nepal, where she traveled to raise awareness for children in need, on behalf of UNICEF. She's been posting a slew of pics from her adventure on Instagram...and fans are loving it! Gomez is currently the hottest celeb on the photo-sharing site, according to E!'s new Instagram wall, which provides fans with the latest posts from your favorite celebs and gives an inside look at each star's Instagram activity.