Christina Aguilera This month, power vocalist and pop superstar Christina Aguilera stars on the November cover of REDBOOK . In the issue, the coach of NBC’s smash hit, The Voice, opens up about her co-stars on the reality singing competition, her decision to leave last season and her new workout philosophy. Why she left The Voice: I needed to decompress, wind down the clock and just breathe. I needed to find out who I am outside of that red chair. On why working out is not her priority: If I have to choose between working out and spending time with my son after a hard day, it’s not even a question. On how she looks at her co-stars on The Voice as family: I know these guys so well, they really are like my brothers, no joke. There’s a 12 year-old-boy in me who loves to come out and play with them.