'The Voice': Gwen Stefani Brought to Tears by Blake Shelton's 16-Year-Old Singer

Gwen Stefani couldn't hold back her tears during Monday's final knockout round on 'The Voice!' The emotional moment happened when Blake Shelton's team member, 16-year-old Brayden Lape, performed 'Mercy' by Brett Young. Gwen called Brayden 'so sweet' and a 'natural' following his rendition of the country song, and explains why she got emotional. ‘The Voice’ airs Mondays at 8 p.m. ET/PT on NBC.