In 'The Let Them Theory,' Mel Robbins charts a path forward to release what you can't change — and seize what you can.

Mel Robbins, author of ‘The Let Them Theory,’ greeted fans at an event in Boston in January. Photo: Erin Clark/Boston Globe/Getty Images. By . Jeffrey A. Trachtenberg. and .

Mel B snaps during interview after statement from Stephen Belafonte denying abuse is read "My mum was the kind of person that would say, 'Oh you've left him now, you're fine.' But that couldn't be ...

Joining the trio is iconic singer, songwriter Mel B, who was on the series from Seasons 8-13. “Last time I was on the judging panel, I was in a very different place,” explained Mel B.

Mel B celebrates her teenager Angel's 18th birthday, saying she "couldn't be prouder of watching you grow." The singer shares her child with ex Eddie Murphy.