Prince Jackson looks in good spirits as he shows off a hint of muscle in tank top... after suggesting Michael isn't his biological father during feud with Twitter troll

He recently hit out at Twitter trolls who questioned whether he was biologically connected to pop icon Michael Jackson. 

But despite the negativity, Prince Jackson cut a cheerful figure when he stepped out for a stroll in Los Angeles on Saturday.

The 18-year-old could hardly contain his smile as he sauntered in the Californian sunshine alongside a male pal.

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Stil smiling: Prince Jackson cut a cheerful figure when he stepped out for a stroll in Los Angeles on Saturday

Choosing to keep cool in the warm climes, he flashed some muscle in navy tank top, emblazoned with the Ford logo.

Defying the proverbial fashion rule that is 'blue and green should never be seen,' the teen paired the look with khaki cargo shorts and black running trainers.

He tied the look together with a blue and green baseball cap, while an array of gold chains, as well as a set of headphones, were draped around his neck. 

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Good spirits: The 18-year-old could hardly contain his smile as he sauntered in the Californian sunshine alongside a male pal

Prince's outing comes just a short while after he hinted that Man in the Mirror crooner Michael wasn't his biological father after being targeted by online trolls.  

When firing back at one particular user, the college student suggested that there might be a chance that the Gloved One isn't his biological father, but that doesn't change the way he feels about him, according to TMZ.

Responding to a Twitter user who wrote, 'Everyone knows you are a Rowe-Klein NOT A Jackson!! Yall should stop trying to put on a FAKE front and get real,' Prince, rather cryptically, tweeted: 'The blood of the covenant is thicker than the water of the womb'. 

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Relaxed: Choosing to keep cool in the warm climes, he flashed some muscle in navy tank top, emblazoned with the Ford logo 

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Low-key: Defying the proverbial fashion rule that is 'blue and green should never be seen,' the teen paired the look with khaki cargo shorts and black running trainers

While the youngster didn't refute the claim - he merely embraced Michael as the one who raised him and cared for him.

The social media encounter only served to dredge up old rumours - that Dr. Arnold W. Klein was the one who fathered Prince and Paris, Michael's childen with Debbie Rowe.

The Beverly Hills dermatologist, now 70, stirred the controversy in January 2013 when he posted an old driver's license showing himself as a young, brown-haired lad alongside a photo of Prince.

'Hmmmmm,' Klein wrote in the caption. The likeness between Prince and Klein was uncanny.