Gwen Stefani is going B.A.N.A.N.A.S about the Montana wilderness.

The 45-year-old Hollaback Girl singer is currently enjoying a holiday in the American state, and has declared it her favourite vacation ever.

The star, who was raised in densely-populated Southern California, seemed blown away by the forests and open fields of Montana.

“Wow #Montana u r so beautiful #favoritevacaever #neverwanttogohome,” she wrote in a caption on one Instagram photo, where she poses with her 17-month-old son, Apollo.

Gwen and her husband, Gavin Rossdale, also have Kingston, nine, and Zuma, six. It is unclear whether Gavin and Apollo’s older brothers were also on the Montana trip.

Another post featured a clip of Gwen riding through a forest on horseback.

The singer only joined Instagram back in January.

Speaking to Cosmopolitan magazine, she explained: “It took me a while to get into. It’s so awkward. Who said it’s OK for me to sit in my kitchen and take pictures of myself until I find one I like?”