Early reports state that Canadian crooner Justin Bieber had been attacked onstage during his concert at Dubai. While this incident is a tad bit normal for Hollywood celebrities, fans sometimes go beyond obsession bordering on crazy. Here are a few celebrity incidents involving crazed fans, from Justin Bieber to Harry Styles.

First up is 19-year-old singer, Justin Bieber. The "Believe" singer finally made it on time for one of his many concerts. However, one fan was either not or too pleased with the event that during Bieber's performance, the fan jumped on stage and grabbed Justin.

"Justin's guards ran to his aide and swarmed the attacker, a young male wearing a white t-shirt and jeans," reports The National, adding, "After the fan threw down the grand piano on stage in an attempt to evade the security team, they were finally able to contain him. Thankfully, no one was hurt in the random attack."

While the attack certainly surprised a lot of fans watching the concert, Bieber remained unfazed and made sure the show went on.

"Justin actually hardly missed a beat. Performing his set closer, "Believe" when the fan grabbed him, Justin slipped away to the side of the stage and actually kept singing as if nothing had happened. His eight-piece band followed along, and Justin successfully finished the concert. After a three-minute break Justin took the stage again for a two-song encore of "Boyfriend" and "Baby," reports Hollywood Life.

Bieber isn't the only celebrity to be attacked by a fan. One Direction's Harry Styles had also been a victim during the groups' February concert in Glasgow. Harry Styles took a shoe to the groin during One Direction's tour in Glasgow. According to reports, the fan had only wanted attention from the boys and she surely got it all thanks to her flying shoe.

Another event when fans attack involves "The Wolverine" star, Hugh Jackman who had the most disgusting case of celebrity obsession. Jackman was currently at the New York gym when the event took place. A woman had burst into the gym declaring her undying love for the "X-Men" star then suddenly chucked a razor covered in her pubic hair at Hugh.

Harry Styles definitely had it better with the shoe as compared to Hugh's "hair"-raising incident. Check out the slideshow to see more celebrities who had been attacked by fans.