Mayweather vs. Pacquiao: Star Sightings

The director of Million Dollar Baby sat ringside at the real-life fight.

The Key & Peele star looked giddy at the Showtime VIP Post-Fight Dinner, held at the MGM Grand.

The president and CEO of CBS was joined by his daughter and wife at the Showtime and HBO pre-fight party.

The power couple was formal and fabulous for the fight. 

The New England Patriots quarterback pulled double duty Saturday, attending the Kentucky Derby in the afternoon and the Mayweather/Pacquiao fight at night.

De Niro took in some of the undercard matchups before the big fight Saturday.

The rapper was ringside for Mayweather vs. Pacquiao.

Wahlberg attended the Showtime/HBO Pre-Fight Party before the Mayweather/Pacquiao showdown.

The late-night host was ringside for the featherweight undercard bout.

The Birdman star posed ringside at the fight.

Trump and wife Melania took in some of the undercard matchups before the Mayweather/Pacquiao fight.

The Back to the Future star struck a pose at the Showtime/HBO Pre-Fight Party.

Jake Gyllenhaal, who plays a boxer in Southpaw, posed with the film's director, Antoine Fuqua, at the Showtime/HBO Pre-Fight Party.

The Affair star Joshua Jackson and wife Diane Kruger attended the Showtime/HBO Pre-Fight Party.

Homeland star Claire Danes attended the Showtime/HBO Pre-Fight Party with her husband, Hannibal star Hugh Dancy.

Rapper and CSI: Cyber star Shad "Bow Wow" Moss looked honored to meet Avengers: Age of Ultron star Don Cheadle at the Showtime/HBO Pre-Fight Party.

The Magic Mike XXL star attended the Showtime/HBO Pre-Fight Party. 

The rapper was spotted at the official weigh-in event on May 1.

The rapper performed before the boxers' official weigh-in on May 1.

The boxing legend showed off some of his championship belts at the Mayweather/Pacquiao weigh-in event.

The Ray Donovan star chatted with boxer Danny "Swift" Garcia after the Mayweather and Pacquiao press conferences on May 1.

The boxers went toe-to-toe at the weigh-in event on May 1.