Tommy Lee Post Full Frontal Nude Pic On Instagram, Fans Shocked

Tommy Lee went FULL frontal on Instagram ... leaving some fans who never saw "that tape" aghast!

The 59-year-old doesn't have a shy bone in his body ... uploading the snap Thursday while chillin' in a tub.

It's unique ... most people who see pics of Tommy first notice all the tats, but the eye can drift in situations like this, right?

Pam Anderson's ex captioned the pic, "Ooooopppsss." Yeah, we're not buying that either.

There were lots of comments ... his wife, Brittany Furlan, responded, "OH MY GOD," while comedian Ryan Sickler replied, "Does the camera add 5 lbs?"

Dating app Grindr jumped on the train ... "Wrong app, babe."

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