's youngest son enjoyed a shirtless stroll through Santa Monica on Sunday in the first sighting since winning big at his first bodybuilding competition.
The 28-year-old - sporting Matrix-style grey sunglasses - showcased his sculpted 6ft 1in muscular body while scantily clad in black shorts and beige flip-flop sandals.
Still clutching his black shirt, Baena was in the zone listening to something on his old-school headphones during the 68°F spring stroll.
The half-Guatemalan athlete recently revealed he packed on 18lbs of muscle in eight weeks in order to prepare to compete at NPC Natural State in Denver last Saturday.
Every bodybuilder who entered the show held at Pinnacle Performing Arts Center was not only drug tested, they also took a 30-minute polygraph test to ensure they were 100 percent natural.
Baena impressively placed first in three men's categories - open bodybuilding heavyweight class, classic physique true novice and classic physique novice - as well as placing second in classic physique open class C.
Arnold Schwarzenegger's youngest son Joseph Baena enjoyed a shirtless stroll through Santa Monica on Sunday in the first sighting since winning big at his first bodybuilding competition
'Thank you all for the sweet messages!' the Christie's real estate agent - who boasts nearly one million social media followers - wrote via Instagram story Sunday.
'Time to do it again on Saturday!'
Indeed, Baena was back in the gym hours later doing leg presses with his trainer, but it's unclear which show he'll compete at next.
The 28-year-old nepo baby - sporting Matrix-style grey sunglasses - showcased his sculpted 6ft 1in muscular body while scantily clad in black shorts and beige flip-flop sandals
