Miley Cyrus had a really tough time getting through her Bangerz tour concert in Boston last night. The singer is mourning the loss of her favorite dog Floyd, who passed away yesterday, and couldn't hold back her tears during her performance. At one point, while singing "I Can't Be Tamed," Miley dropped to ground and started sobbing.

Later that night she dedicated "Landslide" to Floyd saying, "I just wanted to do this song for him because we used to always listen to Fleetwood Mac together."

Watch the emotional moments in the videos below, then click through to see more times celebrities have broken down in tears on stage. Whose performances make you the most emotional? Let us know in the comments below!

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