To quote Emma Stone, "It's like you're Photoshopped!"

Country superstar Tim McGraw flaunted his incredibly ripped torso on Twitter on Monday, in a photo showing him flying around on one of those crazy water jet pack things.

"Here's how I'm spending St. Patrick's Day," he captioned the pic, where it's pretty hard to notice anything but that washboard stomach. 

Did we mention is 46? 

McGraw has been working out a lot in recent years, maintaining a 40 pound weight loss by training with martial arts expert/stunt man Roger Yuan ... the same guy who got Daniel Craig into James Bond shape!

Between that and his sober lifestyle, Tim is definitely in a healthy place these days -- and it looks good on him. Wife Faith Hill is a lucky lady!

Check out the gallery above to see more shirtless celebs.


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