Mayweather vs Pacquiao: Paris Hilton, Drew Barrymore, Justin Bieber in attendance

Paris Hilton looked gorgeous in black as she took a seat near the ring to watch the richest bout. (Source: Reuters)

Paris Hilton was the cynosure of all eyes and she finished her look with a pair of black gloves. (Source: AP)

Not too ahead, Drew Barrymore was in attendance as the top boxers battled out in the much awaited bout. (Source: AP)

He was here too! Justin Bieber was supporting Mayweather. He supported the right guy as the boxer extended his unbeaten run and won the bout by a unanimous decision. (Source: AP)

Aced! Steffi Graff was spotted with Andre Agassi. (Source: AP)

Tennis legend Agassi was seen socialising with top Hollywood actors and some of the former boxing greats. (Source: AP)

And, this man can't be ignored when talk about boxing greats. Mike Tyson made an appearance at the weigh-in but he wasn't happy with the quality of boxing on offer in the bout. (Source: AP)