Not many people have permission to stuff a toy in Blake Shelton's mouth, but apparently Gwen Stefani's youngest son, Apollo, definitely does.

Stefani shared a photo of the power couple and her baby boy on social media over the weekend, along with a caption that read "#summer2017 love u guys gx;" complete with heart emoji and all.

Shelton appears to be getting along well with Stefani's three children — Apollo, 3, Zuma, 8, and Kingston, 10 — which is of obvious importance to Stefani, who shares her children with ex-husband/rock star Gavin Rossdale. The singer even mentioned in a 2017 interview with Extra: "“They’re just into him [Shelton] … Who isn’t? We always have fun together, it’s a blast.”

Stefani also notes in a recent interview with People that her parenting style has changed and is now an ongoing journey that Shelton has become part of. “I was in a band and free my whole life, so I always thought I would be really free with [my kids] and do whatever I wanted, like, ‘Oh, I’ll take them out of school,'" she says. "But you learn that when they have boundaries is when they feel the safest.”

Shelton, who doesn't have children of his own, split from country superstar wife Miranda Lambert in 2015 — his second marriage — and began dating Stefani after their time as celebrity judges on reality singing show The Voice. Since then, Shelton's career has continued to climb and the couple has been heavily in the public eye.

See Blake and Gwen at the People's Choice Awards

Blake Shelton Won't Ride Roller Coasters and It Makes Gwen Stefani Sad