Alessandra's dress was a couture piece from Georges Chakra's AW13 collection so is sadly not available to buy now.
But there are plenty of embellished dresses on the virtual high street that will give you Ale's look.
You really can't go wrong with Saint Laurent, plus we've spotted similar versions on the likes of Calvin Harris, Scott Disick and Wiz Khalifa.
He's very protective of his relationship, so isn't going to want to make a big show of things...
The genetically gifted duo sparked speculation they are now dating while attending a gig together in New York recently. If you're off on a summer holiday then don't dismiss a Hawaiian shirt yet. He donned this jazzy Saint Laurent number here and to be honest, we're digging it.
You may have a vivid image of Hawaiian shirts with board shorts and flip-flops that's putting you off, but why not layer yours over a white T-shirt to keep it fresh?
Harry said: ‘I don’t know her, I’m sure she’s a wonderful person.
I hate you all so much.’ If that’s the case, things have moved very fast between the pair.