At times, Floyd Mayweather Jr. and Manny Pacquiao's buzzed-about boxing match felt more like an award show. That's because Showtime and HBO's live special brought out stars like Beyoncé and Jay Z, Ben Affleck [1], and Drew Barrymore [2] — just to name a few. Before Floyd beat Manny [3] on Saturday, reporters interviewed plenty of the celebrities in the audience, including Tom Brady [4]. Continuing his fun spree since his glorious Super Bowl victory [5] with the New England Patriots, the quarterback kicked back at the fight on the same day he hit up the Kentucky Derby. Meanwhile, Justin Bieber was on hand to support his pal Floyd. Justin even joined the boxer and his entourage for the prefight walk through the MGM Grand Garden Arena. As musicians like Justin and Beyoncé took the night off from performing, Jamie Foxx [6] grabbed headlines with his unique spin on "The Star-Spangled Banner." [7] Read on to see the most star-studded moments from the event, including appearances from Jake Gyllenhaal [8] and Nicki Minaj.

Ben Affleck

Drew Barrymore

Nicki Minaj

Tom Brady and Robert Kraft

Jamie Foxx

Floyd Mayweather Jr. and Justin Bieber

Manny Pacquiao and Jimmy Kimmel

Mark Wahlberg

Claire Danes and Hugh Dancy

Jake Gyllenhaal and Antoine Fuqua

Paris Hilton

Denzel Washington and Antoine Fuqua

Michael Keaton

Claire Danes, Bridgid Coulter, and Don Cheadle

Steffi Graf and Andre Agassi

Antoine Fuqua, Jake Gyllenhaal, and Mark Wahlberg

Mike Tyson

Donald and Melania Trump

Leslie Moonves and Julie Chen

Charles Barkley

Beyoncé

Drew Barrymore

Tom Brady

Jake Gyllenhaal, Antoine Fuqua, and Gayle King

Justin Bieber

Jamie Foxx

Tom Brady

Jake Gyllenhaal

Mark Wahlberg

Beyoncé, Jay Z, and Mary J. Blige