From lying on the couch to a full-body mirror selfie, the "Peaches" singer showed off the leggings from all angles ...

Justin Bieber's predicting a summer for the ages ... the first with his son Jack Blues Bieber ... and it looks like they'll ...

In addition to wearing the shirt with his own face, he also wore gray basketball shorts and a black baseball hat. Hailey simply captioned the photo of him, “correct.” Related: Justin Bieber ...