After being detained by customs for four hours at the Los Angeles International Airport on Thursday, pop phenomenon Justin Bieber was finally released and is currently back in the States.

The 20-year-old Canadian singer posted a photo on Twitter after he was released: "All smiles," he wrote as the caption. Likewise, his manager Scooter Braun tweeted about the incident, writing, "That was a long day. Bring on Friday."

Justin landed in Los Angeles at around 1 p.m. PST on April 24 with his mother and his friends, however his ride, baggage and entourage were still waiting outside at 4 p.m. PST. According to E! News, authorities questioned the "Beauty and a Beat" star "for the last two hours inside the airport's Tom Bradley International Terminal," while his entourage were "standing around waiting for him."

Some news reports say the matter occurred due to his string of legal woes, however, People magazine reported that he was held "for routine secondary questioning" but "was not being kept out of the United States."

In July, Bieber will go on trial in Miami on charges of driving under the influence and resisting arrest. Plus, he is awaiting a misdemeanor assault case in Toronto, while he also might face prosecution in LA over a felony vandalism case for throwing eggs at his neighbor's house.

In response to the controversy, his attorney Mychal Wilson told HollywoodLife.com that the customs officials giving him the third degree procedural due to his hefty criminal record, and it doesn't mean that he's facing any new charges.

"The 2001 Patriot Act, signed by former President George Bush and extended by current President Barack Obama, gives custom officials the broad authority to flag travelers arriving from a foreign country when they have an active criminal case or a conviction," said Mychal. "Presumably, Justin Bieber is on the Homeland Security watch list due to the various pending criminal charges against him."