Showbiz journalist Dan Wootton told Daybreak that pop star Justin Bieber is "under a huge amount of pressure."
Wootton said the singer has had to deal with a "huge backlash" this week for the first time in his career.
Earlier this week Bieber turned up two hours late for a gig at the London O2 Arena.
Wootton, who has spent time with the star on tour added, "I just think it was too much for him."
Justin Bieber's visit to London has included illness, a late appearance and now fisticuffs after the pop star lashed out at a photographer.
Justin Bieber apologised to his young fans and their furious parents today after he turned up late for his concert last night.
Justin Bieber angered fans by showing up nearly two hours late for his London concert last night - but he's not the first musician to do so.