And here are the results coming in From MadIsTheNewNormal:
Lupita - sorry, massive fail. That ultra-deep neckline is all wrong and makes her chest look scrawny (positively anorexic in fact) and it makes her proportions look all skewed. Hate the colour on her as well. NIL POINTS
Charlize - Lovely skirt but I'm not wild about the strap/bodice configuration going on. That slash all the way to the stomach is really hard pull off. She does it better than Lupita though. I also hate being able to see the bits of not-quite-invisible plastic, or the flesh coloured sheer fabric that holds something up. Either make it completely invisible or don't have it.
Cate - ditto. I'm a bit over the flesh/nude thing now, it flatters so few people and I don't like that you can see the nude sheer stuff up round her neck - it's a bit frumpy from some angles.
Amy Adams - a safe choice but lovely. simple, elegant and the midnight blue really suits her.
Angelina - lovely, especially the back.
Jennifer Lawrence - it's ok. She pulls the colour off well, if Heinz Tomato soup is your thing. Not that keen on the half peplum.
Sandra B - lovely colour on her, the dress is nice but not great.
Penelope - from the front I love it. From the back it looks like a maternity dress.
Camilla Alves (with Matthew McConnaughy) - Gorgeous. I love it.
Jada - not keen.
Julia - well it depends on which photo you look at.....I think I adore it, but one of those shots makes her look like she has massive saggy tits and no bra!
Kate Hudson - very nice indeed. Very Joan Crawford/Bette Davies.
Gaga - lovely dress but not keen on the chiffon scarf thing. It makes it look dated/frumpy. And why does the Gaga always look about 52 when she actually about 14?
Anne Hathaway - lovely, simple, elegant.
Jennifer Garner - pretty.
Emma Watson - gorgeous.
Kerry Washington - mmm...beautiful colour but wearing strapless when you are PG tends to make you look like you are wrapped in a bath towel. It had loads of potential but would have been better with at least one shoulder or some straps!
Naomi Watts- gorgeous
Olivia Wilde - spectacular
Meryl - lovely. And it sounds out the message 'yeah...been here millions of times, I'm cool about it all....' 
Margot Robbie - beautiful from the front, but that huge bow on the back is slightly odd.
Jessica Biel - very pretty
Kristen Bell - very pretty - a bit too bridal?
Goldie - the colour looks great on her, and I like the beaded arm bits, but they give the impression that the bodice is being dragged downwards a bit.
Sally Hawkins - gorgeous. difficult colour to pull off and all that chinky beading risks adding too much bulk, but it looks great on her.
Elsa Pataky (PG in the teal beaded thing) bloody awful. Such a shame as it's a beautiful colour, beautiful beading, beautiful neckline and then RUINED with that horrendous band under her stomach. I have no problem with accentuating your bump but that's all wrong.
Portia Di Rossi - stunning, especially from the back.
Chrissie Teigan (with John Legend) lovely.
Laura Dern - drab colour, makes her look washed out. If are going to wear nude it needs some sparkle or some lace or great sleeves, or something. This looks a bit meh.
Julie Delpy - Nude, but gorgeous. That's the way to do it.
Christina Cavellari (PG in white) lovely
Callista - lovely
Idina Menzel - lovely, classic
Viola Davis in the emerald/jade - mmm, not really keen but not sure why.
June Squibb - very lovely for an older lady.
Sarah Paulson - ok
Kristen Chenowith - Gorgeous. So glamorous, great structure.
Anna Kendrick - not really
Glenn Close - fantastic. Love it. Classy, classy, classy.
Veerie Baetens - HATE that bodice and the spaghetti straps. Looks like chest binding!
Ireland Baldwin - really great colour, very pretty lace.
Bette Midler - absolutely stunning and suits her so well. i want this for me.
Olga Kurylenko - lovely
Lorna Luft - gorgeous dress although I would have liked to see better definition/shape in the bodice.
Liza Minnelli - bloody fabulous. Top notch.
Scheherazade Goldsmith - beautiful.
Kelly Osborne - beautiful. She often gets it really wrong but this is spot on.
Giuiliana (who??) meh....bit too bridal and makes her look thick around the middle which she obviously isn't.
Nancy O'Dell - lovely.
Maria Menounos - gorgeous
Tara Lipinski - wedding dress made out of her mum's old nets?
Rachel smith, safe choice but really stunning.
Right. Off to read the thread and compare notes now.