The truly annoying-faced are rarely 'ugly', as such. It's weird, it's difficult to define.
One of the worst offenders, for me, is this:
I mean, the creepy Hollywood rictus is bad enough by itself, although hardly unique to her; what's really annoying, however, is the way she invariably plays 'sexy' characters*, and the way she
thinks she's the hottest thing on the planet (whether as a result or as a cause of her typecasting, I don't know). But she's got this jaw that's bigger and squarer than David Coulthard's, and the only notably 'sexy' thing about her (note the '') is her massive fake tits, which aren't even remotely convincing fake tits at that: they're those horrible half-beachball jobs that stick out like a couple of weird chest-tumours.
*as nicely summarised by Dennis Pennis: "If it was done really tastefully, and wasn't at all gratuitous, would you consider
leaving your clothes on in a movie?".