Posted on Mon Feb 13, 2012 01:15 PM PDT
Justin Bieber, who is just weeks away from turning 18, is showing off his developing pecs while horsing around at the beach in Malibu with stepbrother Jaxon.
The "Baby" singer, sporting a beanie and his numerous tattoos, enjoyed swinging the little tot around in the sand while his dad, Jeremy, looked on. Be careful, Biebs ... you don't want to pull your little bro's arms out of the socket!
Nothing like bonding on the beach in the 'bu!
See more of Justin shirtless in our gallery below.
SEE THE GALLERY Justin Bieber Goes Shirtless In Malibu
Justin Bieber And Little Brother Jaxon Fly In Style, "As Long As You Love Me" Music Video Debuts - Aug 01, 2012
Justin Bieber Shows Off His Baby Guns In A Tank Top - Jul 31, 2012
Justin Bieber's Bodyguard Takes His $100K Chrome Fisker Karma For A Spin - Jul 27, 2012
Justin Bieber Gives Sneak Peek Of "As Long As You Love Me" Music Video - Jul 27, 2012
Justin Bieber Takes Aim At The Camera - Jul 26, 2012