25 biggest celebrity MMA fans: The Rock, Snoop Dogg, Madonna and more

LAS VEGAS, NV - MAY 23: (L-R) Daniel Cormier, Arnold Schwarzenegger and Chris Weidman pose for a portrait during the UFC 187 event at the MGM Grand Garden Arena on May 23, 2015 in Las Vegas, Nevada. (Photo by Mike Roach/Zuffa LLC/Zuffa LLC via Getty Images)
LAS VEGAS, NV - MAY 23: (L-R) Daniel Cormier, Arnold Schwarzenegger and Chris Weidman pose for a portrait during the UFC 187 event at the MGM Grand Garden Arena on May 23, 2015 in Las Vegas, Nevada. (Photo by Mike Roach/Zuffa LLC/Zuffa LLC via Getty Images) /
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ANAHEIM, CA – NOVEMBER 12: Actress Mandy Moore (L) and UFC Fighter Jon Jones (R) arrive at the UFC on FOX: live Heavyweight Championship fight at Honda Center on November 12, 2011 in Anaheim, California. (Photo by Paul Archuleta/FilmMagic)
ANAHEIM, CA – NOVEMBER 12: Actress Mandy Moore (L) and UFC Fighter Jon Jones (R) arrive at the UFC on FOX: live Heavyweight Championship fight at Honda Center on November 12, 2011 in Anaheim, California. (Photo by Paul Archuleta/FilmMagic) /

7. Mandy  Moore

Before Mandy Moore was making us cry on This is Us, she was rubbing elbows with some of the UFC’s biggest stars. The actress/singer is so into MMA that she even gave her prediction for the UFC on Fox: Cain Velasquez vs. Junior Dos Santos fight. She ended up picking Velasquez for that bout (which was wrong) but he did win two more fights against Dos Santos after that so she wasn’t far off.

A particularly gossip-friendly part of her fandom was the rumor that she and UFC welterweight (and middleweight) champion Georges St-Pierre were dating. Rumor has it that UFC President Dana White introduced the pair, though both Moore and St-Pierre denied any romance occurred.

Moore has been spotted at numerous shows, though less since she’s had an increased production schedule, though no doubt she is still watching.

6. Ed O’Neill

Ed O’Neill may be the only celebrity on this list who truly understands the sport from another perspective — he’s a highly trained Brazilian jiu-jitsu practitioner. O’Neill has been training for more than 20 years under 22 Rorion Gracie and received his black belt in December 2007.

Though he isn’t often spotted sitting cage-side at events, he’s highly knowledgeable in the sport and is often asked to give his expert opinions. He also appeared on the famed Fighter and the Kid podcast talking everything MMA.