Disturbing Image of the Day

It's come to this: Michael Bloomberg as an aging hippie, hanging out with the cast of the Jersey Shore.

Mayor Bloomberg let his hair down last night.

Hizzoner hammed it up as "Berg," an aging hippie in "Mair" -- a musical spoof he performed for the annual Inner Circle charity dinner with help from the cast of Broadway's "Hair."

The Big Apple's big cheese even got a little help on stage from the Garden State's finest fist-pumpers: Nicole "Snooki" Polizzi and Mike "The Situation" Sorrentino from the "Jersey Shore."

"Just got done chillen with nycmayor," an ecstatic Snooki tweeted after performing with Bloomberg. "I showed my hair poof for mayor B!"

The mayor seemed taken with Polizzi, calling her "very nice and cute," after the show.

"She seemed more excited to be there then we were to have her," he quipped.

Bloomberg also joked off stage that he and the Situation, who is known for his abs, look the same shirtless.