Gwen Stefani and Blake Shelton's relationship must be getting stronger because now the "Used To Love You" singer's children have completely warmed up to the country star.

"Blake loves kids and has been having a lot of fun when he spends time with Gwen's kids," a source close to the couple told People of Shelton's bond with Stefani's sons Kingston, 9, Zuma, 7, and Apollo, 22 months. "They adore him."

The Voice coaches have reportedly "spent a lot of time together and with her family," said the source.

But Shelton has apparently welcomed Stefani into his family as well. According to People, Shelton introduced Stefani to his mother when he recently brought her home to Oklahoma.

Stefani and Shelton went public with their romance in November although they were both fresh off a divorce.

Shelton had pretty much finalized his divorce from Miranda Lambert as Stefani simultaneously split from Gavin Rossdale, who allegedly cheated on the No Doubt songstress for years with their children's young, blonde nanny.

Because of recent rocky times, Shelton and Stefani aren't trying to rush things between them.

"They're just having fun and enjoying each other," the source added. "There's no pressure. They've been able to support and relate to each other and have gotten through a very difficult and now triumphant time in their lives."