With no Kardashian/Jenner family holiday party to attend, new parents Justin and Hailey celebrated ... to change out of her PJs. Bieber wore blue striped boxer shorts (her husband's, perhaps?) ...

Hailey Bieber was recently spotted nailing a fun ... Her fitted pair included a pair of Alo biker shorts with a basic black crewneck t-shirt, likely from the same athletic apparel brand.

According to Hailey Bieber, a leather jacket works for all ... unzipped to show off her black crewneck and matching bike shorts from Alo. Bieber kept her look incognito, hiding her face with ...