PRETTY BOY BRAD HITS ROCK BOTTOM!

Freaking over old man butt

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HOLLYWOOD stud Brad Pitt is looking amazingly hunky for a guy turning 60, but one flaw is giving him a pain in the rear — his flat, bony, old man’s butt, spies snitch.

A tattletale says while “Brad looks incredible in his upper body” the Bullet Train assassin, who hits 60 on Dec. 18, is feeling “insecure” over his saggy caboose.

“His rear isn’t much to look at because he’s so lean and focused on other areas like his biceps and pecs,” spills the insider.

“Exercises like squats and other lower body work have been pushed to the bottom of his priorities for many years and now it’s really showing.”

As GLOBE has reported, sources say the stress of his toxic divorce and custody battle from Maleficent witch Angelina Jolie, 47, took a serious toll on his health and robbed him of his appetite.

“He lost so much weight after the divorce and has had to work hard to put it back on. Unfortunately he’s still got a very flat butt,” the tipster tattles.