I’m sorry, I’m not noticing any forehead.
I’m pretty much with you. All of the women referred to in this thread are hot (with the exception of Christina Ricci who has just that little bit too much forehead).
Lisa Kudrow.
Jennifer Love Hewitt: http://www.nudecelebsus.com/jennifer-love-hewitt/jennifer-love-hewitt-1.jpg]
Ben Affleck ands Jennifer Garner. I assume their child was delivered via caesarian and will be a FOREHEAD MONSTER
Mena Suvari, hands down. Christina Ricci is next in line. Reese Witherspoon’s forehead looks positively miniscule in comparison.
That child’s head was probably not only huge, but peanut shaped. Jennifer Garner’s head is a big ol’ figure eight.
And, while we’re critiquing Alias forehead, Michael Vartan.
Mike Farrell, Doogie Howser (forget his real name) and Kiefer Sutherland (who should also be on the definitive too much chin list.)
I can’t think of anyone to add to the list, but I thought I’d add that my girlfriend and I love to call this condition a “Far-head”…I’ve also heard “FiveHead” but I like ours better. 
Moderator clears throat: Just to be clear, I’ve disabled the link in Happy’s post as being “not safe for workplace.” It’s not nudity, but it’s not a picture I would want on my screen if my boss walked by. Please see Forum Rules and note post #5.
Can there really be any answer other than Klaus Kinski, with his pinched-up little face and the forehead that suggests he may have three or four brains inside there?
Sorry ‘bout that. In that case, while you’ve got the ol’ link disabler out, you might wanna see my Yamma Hamma in post #18 too.
While my boss probably wouldn’t have a problem with Tyra Banks in her panties, I imagine this goes against the SFW rule too.
Happy
I can’t believe no one has mentioned Robert Vaughn and especially David McCallum, the Men from U.N.C.LE. What, were they casting Metalunans back in those days?
And speaking of 'Lunans, the moonbase chick from UFO had too much forehead, but it was counterbalanced by her large rack.
Vincent Schiavelli, the patron saint of ginormous foreheads, whose glorious dome we so recently lost. 
Here is his forehead putting John Lithgow’s and Christopher Lloyd’s (no slouches themselves) to shame.
What’s it like working for the Amish?
Uma Thurman. I like her, but I have to admit she has a huge, domed, eggshell-colored braincase. Whenever she’s killing Bill, everyone else is thinking “nice swordplay” and I’m thinking “Watch your head! WATCH YOUR HEAD! DOn’t bust that thing open!”
Sailboat
Nobody mentioned Alexis Bledel yet? I’m shocked. How about Luke Perry back in his “90210” days? He had a forehead like a drive-in movie screen.
I can’t get passed Reese Witherspoon’s chin. It is so distracting.
I realized long ago that most of the women I see pictures of and really like seem to have overly-large foreheads.
I see Mena Suvari listed, too. I think she kind of defines it.
And I think Heather Graham is kinda largish in the forehead area.
-Joe, Mena is not on my list, but I think that’s more cuz she’s crosseyed