The 20-year-old 'Baby' hitmaker kept his 20.1 million followers in the fold about the trip by uploading some cowboy-style snaps along the way.
In one taken from horseback, the 22-year-old actress can be seen riding a few feet in front of Bieber who is close behind on a white stallion.
In a black and white snap, the duo is seen getting close as they posed for side-by-side selfie. The shot was without a caption.