What will Anderson Cooper be doing tonight? Unvogue Magazine says he'll be attending a party at the Sapphire Go-Go Lounge for their men's issue. It's been informally dubbed "Anderson Cooper's Big Fat Coming Out Party." [UPDATED: AC's denial below]:

We got a tip from an insider that Unvogue spent weeks trying to persuade AC to be the host of tonight's party at the Sapphire Go-Go Lounge—which coincides with the start of Gay Pride week. GET IT?

A staffer on Anderson Cooper's CNN show took a message and promised to get back to us, but hasn't. Unvogue editor K. Tyson Perez demurred, saying "we are slightly annoyed that our big secret is getting out before we have had a chance to 'officially' announce it ourselves." But Unvogue's PR person confirms to us that they have "confirmed Mr. Cooper's attendance."

But this isn't just any crappy party! According to our tipster:

Anderson was absolutely amused by the name of the online magazine and said his mother [Gloria Vanderbilt, eroticist] would love the boldness of it. Undeterred by not having Mr. Cooper as an official host, it didn't take long before the entire Unvogue staff began rebranding the event as, "Anderson Cooper's Big Fat Coming Out Party!' LOL!!! They are now hard at work concocting some fancy new sponsored Macari wine spritzers (how deliciously gay) and instructing their go-go boys to rehearse a special lap dance appropriately dubbed the A.C. 360. LOL! We couldn't help but wonder if the A.C. 360 concludes with an explosive happy ending as we all know Anderson loves the sounds of bombs…

We also hear a certain American Idol contestant may make an appearance along with AC. It all sounds quite juvenile and we have a hard time believing Anderson Cooper would be interested in such things, but in any case, don't let us stop the fun, guys. Proceeds "go to benefit HIV Arts Network, Inc," for the record. Send pics!
[Although: AC was reporting live from Paris last night. Is this party awesome enough for him to fly back for? Pics or it didn't happen.]

UPDATE: I just spoke with Shimrit Sheetrit, Anderson Cooper's personal rep, who said "I can guarantee you Anderson is not attending" this party tonight. Sheetrit said Cooper is back in New York and doing his show as usual tonight.