Blake Lively Clothed in Venice

Blake Lively had angst all over her face Thursday ... as she cruised the canals in Venice, Italy with Leonard DiCaprio -- the first time she was photographed since those nude photos hit the Internet.

It appears Blake was using an iPhone 4 on the boat ... an upgrade from the old iPhone featured in the naked pics ... especially when it comes to the camera feature.

Blake Lively The Hacker Strikes Back

Blake Lively's people say those nude pics are definitely NOT her -- even though the hacker says otherwise. So, the one fact we're sure of is ... 'NOT Blake Lively' is smoking hot ... whoever she is.

Check out TMZ on TV -- click here to see your local listings!

More 'Blake Lively' Nude Photos Leaked

The hacker who claims to have naked pictures of Blake Lively has just upped the ante, scoffing at claims the pics are photoshopped ... and he's posted more pictures to prove his case.

The hacker just posted 17 additional pics. Many of the pics show a nude woman whom the hacker insists is Blake.

Blake's people are adamant ... telling TMZ the person in the pics is not Blake. The denial apparently incited the hacker, who posted the new pics, with this warning: "Oh, yes, Blake's rep. These are totally fake. We really, really believe you. Want moar? BTW, thanks for all the faps." (FYI: "faps" is a reference to pleasuring oneself)

Two of the pics show a woman clothed, holding an iPhone, and it sure looks like Blake.

Several of the nude pics show a woman's body with tattoos (no face). Several TMZ users contacted us with an interesting point ... Blake's character in "The Town" had star tattoos on her upper-chest area.

Blake Lively: Nude Photos NOT Me!!!

The photos circulating around the Internet purporting to be Blake Lively are fake, phony, Photoshopped, fabricated, fictional, false ... so says Blake and her people.

Sources with intimate knowledge of the actress' physical features tell TMZ ... it's simply NOT Blake's body ... and there are definitive markers proving the pics are fake.

Blake has hired a lawyer who is sending threatening letters to anyone who publishes the pics and implies it's her.

We did notice a 2008 photo of Blake holding the exact same phone as the one shown above, but the phone is pretty common.