Gavin Rossdale 'suspicious' Gwen Stefani had cheated on him

Gavin Rossdale is reportedly "suspicious" Gwen Stefani was cheating on him.

The 'What You Waiting For' hitmaker and the Bush frontman announced they were divorcing in August and with the 46-year-old beauty recently confirming her romance with fellow 'The Voice USA' coach Blake Shelton, Gavin is said to be thinking the worst.

The 50-year-old musician believes the timing of Blake's split from ex-wife Miranda Lambert in July is too much of a coincidence and claims she is trying to make him look like the bad guy to avoid anyone concentrating on her relationship with the 'God Gave Me You' singer, TMZ reports.

Meanwhile, Gwen - who has children Kingston, nine, Zuma, seven and 20-month-old Apollo with Gavin - recently praised her new "rad" boyfriend for "really helping" her through the break up of her marriage.

She gushed: "There's been loads of people that have helped me with this tragedy. There's definitely key people that have pointed me into the right direction. Blake really helped me. He's a pretty rad guy, I have to say that."

And Gwen recently admitted there had been "hard times" in her personal life before the birth of their youngest child.

She added: "I got so much out of that first season that I didn't expect, creatively, from being around so much music.

"There were hard times before the baby, personally, that were just not good. And then having Apollo, and being on the show, and being refreshed - it was just like, 'Whoa!'"