Gwen Stefani and Blake Shelton are official about their new couple status, but not everyone fully supports their new relationship.

Stefani's ex husband, Gavin Rossdale, has reportedly opened up about their new relationship. Rossdale and Stefani had been married for 13 years and have three sons together.

Rossdale was allegedly "suspicious" over the timing of Shelton and Stefani's new relationship, reports TMZ. The relationship was announced after both Stefani and Shelton had filed for divorce from their spouses, The New York Post notes.

Rossdale suspects that the two got together long before the official announcement. Stefani and Shelton are both judges on NBC's The Voice and had worked several seasons together. Shelton filed for divorce from fellow country star Miranda Lambert back in July. Stefani announced that she and her husband were splitting up only a month later.

As previously reported, a spokesperson for Stefani confirmed that after being friends for a while, the two had in fact started dating.

The new couple has been spending time together in Nashville.