ByAmy Kaplan, writer at Creators.co
Lead Staff Writer // Follow me on Twitter and Instagram @PhotoAmy33
Amy Kaplan

How knowledgeable are you on your favorite celebs abdominal muscles? Can you tell the difference between Ronda Rousey and Reese Witherspoon if you only saw their abs?

Take this quiz to find out and then tell me how well you did in the comments below!

Is this a Hollywood actor or a UFC fighter?

UFC Fighter: This is recently suspended Chad Mendes

Is this a Hollywood actor or a UFC fighter?

Hollywood actor: This is Jacob from the movie Twilight (Taylor Lautner)

Is this a Hollywood actor or a UFC fighter?

UFC Fighter: This is Conor McGregor, pre tummy tattoo... Tricked you!

Is this a Hollywood actor or a UFC fighter?

UFC Fighter: This is Cris "Cyborg" Justino, I gave you a little hint with the brass knuckles on the bikini.

Is this a Hollywood actor or a UFC fighter?

NEITHER! I cheated on this one... this is actually soccer star Cristiano Ronaldo and I just wanted to look at his abs.

Is this a Hollywood actor or a UFC fighter?

Hollywood! This is actually Halle Berry, a former bond girl in her amazing bikini body.

Is this a Hollywood actor or a UFC fighter?

Hollywood actor: This is Superman! Errr.. I mean Henry Cavill.

Is this a Hollywood actor or a UFC fighter?

Hollywood actor: This is Idris Elba and his amazing physique.

Is this a Hollywood actor or a UFC fighter?

UFC Fighter: This is former champion Ronda Rousey during one of her Sports Illustrated shoots.

Is this a Hollywood actor or a UFC fighter?

UFC Fighter: This is Sage Northcutt... As if I could do an abs story and not mention him!

Is this a Hollywood actor or a UFC fighter?

UFC Fighter: This is Jon Jones, I gave you a little peek of his famous bible verse tattoo.

Is this a Hollywood actor or a UFC fighter?

UFC Fighter: Technically he's a Bellator fighter now, but we all know Tito Ortiz!

Is this a Hollywood actor or a UFC fighter?

Hollywood Actor: This is High School Musical Alumn Zac Efron, and my my my has he grown up!

So what did you guys think? Was that hard?