Embattled pop superstar Justin Bieber was reportedly booted out of a nightclub in Chicago, Illinois on Tuesday (09Jul13) amid allegations of underage drinking. The Baby hitmaker and his entourage were partying at local hotspot Bodi when staff served the group alcohol, even though the teenage singer is two years shy of the legal drinking age of 21. Police were tipped off about the incident and quickly arrived on the scene. They questioned club employees and subsequently determined that Bieber had been illegally served alcohol on the premises. He was kicked out of the bar, while club owners were slapped with a citation for knowingly allowing Bieber and his pals to drink booze, reports TMZ.com. Bodi bosses now face a $1,000 (£645) fine if they are found liable for the violation. News of the incident emerges just a day after video footage surfaced online showing a man, purported to be Bieber, relieving himself in a mop bucket in the kitchen of a New York restaurant. The film, believed to have been shot earlier this year (13), also features the pop star spraying cleaning fluid on a framed picture of former U.S. leader Bill Clinton and shouting "F**k Bill Clinton!" The singer has yet to confirm whether he is indeed the star of the clip, but he appeared to show remorse for the controversy on Wednesday (10Jul13) by tweeting, "In life u (you) will make mistakes and people will try and tear u down... but u gotta stay positive. Stay strong.. and learn to be better... and... always live to serve others and The Lord. Growing every day." He is also said to have made amends with the former U.S. president in a phone call. The two incidents are the latest in a long line of headline-grabbing dramas involving Bieber - in recent months, the singer has been caught up in legal woes about photographer fights, traffic violations and reports of bad behaviour on tour.