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.

“Ahhhhh! Rough morning. Trying to feel better for this show tonight but let the paps get the best of me,” the singer posted on Twitter soon after the altercation with the photographer, which took place as he got into a car earlier Friday. The scuffle was captured on video by Channel 5 News and widely broadcast by Britain’s media.

“Sometimes when people r shoving cameras in your face all day and yelling the worst thing possible at u … well I’m human. Rough week,” he wrote on the social networking site.

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.” She demanded anonymity to discuss the star’s condition.

Bieber later posted a shirtless photo of himself in a hospital bed, saying he was getting better and listening to Janis Joplin. On Twitter he thanked “everyone pulling me thru tonight.”

“Best fans in the world,” he wrote. “Figuring out what happened. Thanks for the love.”

Video from the concert shows Bieber appearing to fade during a performance of his up-tempo hit, “Beauty and a Beat.”

PSY set to ride ‘Gangnam’ pony again

SEOUL, South Korea – South Korean rapper PSY says he’ll unveil his much-awaited follow-up to “Gangnam Style” next month and celebrate it with a huge concert in Seoul.

PSY made the announcement Friday on YouTube, where his “Gangnam Style” video has a record 1.39 billion views.

PSY said he’ll release the new single on April 13 and hold a concert at a soccer stadium that evening. He’s dubbed the concert “Happening” and says it will be broadcast live on YouTube.

The rapper, whose real name is Park Jae-sang, has been on a worldwide tour since his viral video made a global splash in July, with its catchy tune and much-imitated horse-riding dance.

At 15, ‘Saved by the Bell’ actress was unaware of fame on TV

NEW YORK – Tiffani Thiessen is probably best known for her role as Kelly Kapowski on “Saved by the Bell,” but the actress says she had no idea at that time how popular the 1989-93 teenage sitcom was.

“I mean, I was so young. I was 15 when I started that show,” Thiessen, now 39, said in a recent interview.

“I remember Mark-Paul (Gosselaar) and I touring the (United) States and going overseas. … That was the first time that I realized what an impact that show had when (thousands of) kids were showing up to these malls and these places where we would sit there for hours and do autograph signings and pictures and stuff,” she said. “That’s when I was really like, ‘Where am I? What is this?’

“I had to constantly remind myself that what I was doing was a job and I enjoyed my job and I was going back to school and do homework like all these other kids who were sitting here.”