
Delia*s: Dress. Aeropostale: Cardigan
Alloy: Heels. ModCloth: Ring
This look could work for any number of occasions. Add the cardigan for the day, and take it off and maybe change into a different pair of heels for night. It's definitely a cute, versatile look, because we don't wear uber-dressy clothes 24/7 like she was able to do.

Forever 21:Metallic Dress, Heels. Delia*sPurple Dress
Asos: Necklace. Windsor: Clutch
This is a good look for those occasions where you do get to get all dolled-up. I included two dresses, because not everyone is comfortable with something as fitted as metallic dress, so I thought the purple one was a good alternative.

Urban Outfitters: Dress. ModCloth: Sandals
Dorothy Perkins: Belt. Monsoon: Bangles
Fred Flare: Necklace
Of the three, this is my favorite look. It's the most wearable look, as well. Overall, it's pretty simple, but I added some accessories (like the cute necklace) to add interest. I mean, the solid dress is pretty much begging for you to add some accessories. I chose to only add a few, to make them the focal point, but if you prefer more, go for it.
So, that's it for Posh Spice. She's another one where you need to ooze confidence. Occasionally shooting a fierce look to those watching you would help, too. Because she had some pretty intense looks.
Also, sorry I'm not particular chatty in this post! I really need to get back into the swing of blogging. But I had the sets made (Sporty Spice's, as well) for a few weeks, so I thought it was better than nothing, since you've already had to wait so long.