Donnie Wahlberg Tweets Naked Pic, Shows Off Six-Pack and More

"Pre show shower time," wrote the cheeky New Kid on the Block singer

Donnie Wahlberg is hangin' tough with the best of them in the shirtless twitpic department, his former underwear-model brother included.

The 43-year-old New Kid on the Block, no stranger to showing off his abs in concert, shared even more of himself than usual with fans last week when he offered up a photo of himself taken as he was about to get in the shower.

Note the strategically placed towel.

"Pre show shower time!" Wahlberg wrote before making the black-and-white shot part of the wallpaper on his Twitter page.

The Blue Bloods star has been on the road this summer as part of The Package Tour, featuring New Kids on the Block, 98 Degrees and Boyz II Men.

"Sometimes there are just no words. Tonights finale of #ThePackageTour was absolutely mind blowing! #ThankYou Indy and NKOTB fans everywhere!" he tweeted last night.

"No better feeling than knowing I gave every ounce of myself on that stage, every single night! You deserve no less!" he added Monday (along with a near-shirtless pic, of course).