Speaking to MTV's The Seven, Brian opened up about rehearsals for the 29-year-old's video and his longtime partnership with her.
Friedman, 33, said: 'This is a dance video. Rehearsals can get pretty rough.
'I think you can expect the unexpected from Britney.
'She is taking risks when it comes to fashion, when it comes to choreography, when it comes to this music - she's grown up so much, and she's pushing 30-years-old soon, so she's a strong independent woman and I think she wants to show that.'