Lindsay Lohan and her surgically enhanced face appeared on “The Late Show WIth David Letterman” Tuesday night, and unlike most interviewers, who tend to kiss her ass as they fake smile at things like a tepid Lifetime movie, David Letterman asked what pretty much everyone is thinking.

Midway through the interview, he asked a braless Lohan, “Now, aren’t you supposed to be in rehab now?”

Lohan responded in a way that made me wish Letterman had a professional bitch slapper on staff. “Do you not watch anything that goes on in the tabloid now? …May 2nd,” she sneered.

What a shock it must have been for her to discover that Letterman hasn’t been consumed with her every eye-rolling move and doesn’t have his calendar marked according to what she’s doing.

“How long will you be in rehab?” Letterman asked. “Three months,” Lohan answered.

Much to the delight of those who love watching a Li-Lo squirm, he pressed on.

“How many times have you been in rehab?” asked Letterman. “Several,” answered Lohan. Even she can’t keep up with the many time she’s been in and out of rehab. Apparently.

“And how will this time be different?” Letterman asked her. “What are they rehabbing, first of all? What is on their list? What are they going to work on when you walk through the door?”

Clearly caught off guard with Letterman’s rehab questions, Lindsay said (with an awkward laugh): “We didn’t discuss this in the pre-interview, I’m just saying to everyone … No, I think, to be honest, I’m the happiest when I’m working and the healthiest, and I think this an opportunity for me to, you know, focus on what I love in life … And I don’t think it’s a bad thing. I think it’s a blessing, and not a curse.”

Lohan never really answered the question about what she’s going to rehab for specifically … but hopefully (for her sake) they do something about that stringy, drunk girl hair she’s been sporting.

As the awkwardness continued, the actress clearly became more and more agitated. But truthfully, what else was he going to talk about?

Lohan was on the show to promote her horrid new film “Scary Movie 5,” in which she stars as herself and pokes fun at her train-wreck of an existence, so it was only natural that Letterman would bring up the fact that she’s in a bad place.