If you had not seen the photo above already and I told you it was Helen Hunt sucking off Paul Reiser during their Mad About You run, or taking a turn with Bill Paxton on the set of Twister you could probably convince yourself it was her. Hell, I have seen the Virgin Mary on a tortilla. You can turn any blurry image into anyone you want. So, when someone says this is Lindsay Lohan and she is sucking Calum Best, I say, "looks like her. We already know she is not much of a prude, so ok."
Now, I'm not saying that it isn't Lindsay Lohan, and I love Celebitchy which is where this was first posted, but to me these facts are exactly the same as the fake Vivica Fox sex tape from a few months ago. The only difference was that was actually a tape, although blurry, and so far this is one screencap.
This could be any blond with long hair who enjoys going down on guys. Notice I said any blond, because honestly I am not seeing breasts in this photo so for all we know this could be John Travolta with a blond wig down on his knees sucking off Tom Cruise. OK, probably not because John is a little heavier and does have big breasts. So have them change positions and that might work.
Now with all that being said, could this be Lindsay? Sure it could. It also could be about 20 million other people.