Gwen Stefani is in a "phase of forgiveness" following her divorce.

Gwen Stefani

Gwen Stefani

The 46-year-old singer admits her divorce from Gavin Rossdale was a "crazy explosion in life" but she says she has come to terms with what happened through her the songwriting process for 'Used To Love You'.

She said: "When I wrote the song, I was sort of in a phase of forgiveness. In a way, I'm getting to this point now, and all the songs up to that point were like, 'Rah, I'm like so upset and so crazy.'

"Everybody knows, pretty much, what happened to me. I got a divorce, which completely was not in the plan at all. For me, it purely wasn't and [it was] a shock and horrible, a crazy explosion in my life."

The 'What You Waiting For' hitmaker - who has three sons, Kingston, nine, Zuma, seven, and Apollo, 20 months, with her ex-husband - also admits she had to "force" herself to get out of bed and go to the studio to channel her energy elsewhere.

She added to Elvis Duran and the Morning Show: "I had to force myself to go to the studio because I really wanted to be in bed crying. That's what you want to do when your life falls apart."