LONDON (AP) -- It's been a rough week for Justin Bieber: Getting booed for being late, struggling to breathe mid-performance and fainting backstage, then caught on camera clashing with paparazzi.

But the 19-year-old pop sensation appeared to have recovered Friday for his final concert in London, singing and dancing to thousands of adoring fans at the O2 Arena.

Earlier Friday, the star made headlines when he got into an altercation with insult-hurling paparazzi, lashing out at a photographer with a stream of expletives as he was restrained by minders.

The clash came just hours after Bieber said he was "getting better" following breathing problems he suffered during the previous night's concert. The star took a short break to go backstage, where he was given oxygen, and had to be briefly hospitalized for a check-up.

A spokesman for the O2 Arena said Bieber was treated backstage during Thursday's concert after becoming short of breath, but recovered and finished his set.

"He was treated by our team of medics and after further examination, they didn't find anything more serious or worrying."

A spokeswoman for Bieber said he was feeling "a little under the weather."

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