AP Photo/Joel Ryan Justin Bieber may be resting easier tonight. The 16-year-old phenom, who admitted to being disappointed by his Grammy loss for Best New Artist on Sunday, salvaged his week by leaving London with the Brit Award for Best International Breakthrough Act. He had to beat Bruno Mars and the cast of Glee to get that! And Bieber wasn’t the only Grammy refugee to be honored overseas… GALLERY: Star sightings at the 2011 Brit Awards Rihanna started out the night in a multicolored, seemingly Cee Lo Green-inspired party dress that immediately had us hankering for slushies...