Hollywood's star-studded Halloween celebrations were in full swing this past weekend, and among the notable attendees were none other than the power couple, Justin Bieber and Hailey Bieber.

Justin Bieber, Hailey Bieber channel Bamm Bamm and Pebbles from The Flintstones for Halloween

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Justin Bieber, Hailey Bieber channel Bamm Bamm and Pebbles from The Flintstones for Halloween