JUSTIN Bieber has sparked fresh concern with his latest Instagram post after confessing he felt "unworthy." The Sorry hitmaker, 31, took to his grid to share snaps showing him on the golf course in very quirky attire. Justin's fans were quick to express their worries as he captured himself mid-swing, with his pants pulled down to reveal his red boxers. The chart star's slender figure could be seen as he stood side-profile, wrapped in a leather jacket and clad in sunglasses. He uploaded a close-up shot of his skills on the course to Instagram as well as one showing his follow through. Dad of one Justin, who shares son Jack Blues with model wife Hailey, 28, then showcased a huge red moon over the skyline. After recently sparking concern with his appearance, fans were left worried by his dress sense - particularly after he appeared swamped in his hoodie just days ago. One wrote: "Pull up your pants….you’re a dad now." Another quizzed: "What's wrong with those pants? You do know that how they look right?" FEELING UNWORTHY The Beauty And A Beat singer recently confessed to "feeling like a fraud" amid rumors of issues in his marriage to model Hailey. He posted a deeply personal message to Instagram on Thursday, speaking out for the first time following fan concern about his wellbeing. In the emotional post, he admitted to feeling "like a fraud" and "unqualified most days". Taking to his Stories, the Baby hitmaker wrote: "People told me my whole life, 'Wow Justin you deserve that.' "And I personally have always felt unworthy, like I was a fraud, like when people told me I deserve something. "It made me feel sneaky like, damn if they only knew my thoughts. "How judgmental I am, how selfish I really am... They wouldn't be saying this." He continued: "I say all this to say, if you feel sneaky, welcome to the club. "I definitely feel unequipped and unqualified most days." Concerns over Justin's health have intensified in recent months, especially after he was seen looking noticeably gaunt and smoking a bong on social media. These were compounded when he shared another cryptic post where he claimed "we don't owe anyone anything." MARRIAGE WOES Justin and his wife Hailey, who welcomed their son, Jack Blues, into the world last August, have been plagued by rumors their marriage is in trouble. The Sun revealed how the couple are said to be "completely out of sync" and struggling with marital issues that are "bigger than just a fight". There have also been multiple times in recent weeks where the couple have not been together. Last month, Justin failed to turn up to the Oscars and left his wife Hailey to walk the red carpet alone. The Canadian pop star's wife was not with her husband and was instead spotted at Paris Fashion Week too.