Watson shows us you don't need waist-length hair to style with braids. Her double French braid twist works best on shoulder-length hair, but if yours is a little shorter, try making the braids smaller and tighter, then tuck and pin the ends underneath the braids to hide any wispy pieces. To get her look:

1. Start by French braiding the left side of the head. As you move towards the back of the head, sweep the French braid down towards the nape of the neck and secure with a clear elastic. The tail of the braid should remain free (we'll come back to that later.)

2. French braid the right side of the head, and work it towards the crown of the head. Secure the braid with a clear elastic and keep the tail of the braid free.

3. Now for the hair magic. Take each of the braids' free tails and swirl them around each other in the middle of the head. Secure the look with bobby pins and lock it in place with a hard hold hairspray like Got2b Glam Force Hairspray, $6.99.

If you made a major chop, go for the faux look. Supermodel Coco Rocha demonstrates the ease of getting a high fashion style that will fool everyone into thinking you somehow managed to create an updo. To get her look:

1. Saturate wet hair with a gel like Redken Hardwear 16, $19.50, and create a deep side part.

2. Use a comb to brush your bangs away from your face, and comb down the rest of your hair (to create a nice sleek surface.)

3. Then, channel your inner rock star and rock your badass vibes all night long.

Dockery's glamorous chignon would no doubt get Lady Mary's seal of approval. To recreate the style:

1.Part hair down the center and knot at the nape of the neck. You can tie hair like a shoestring for the same curvy, braid-like effect. Secure with bobby pins.

2. Insert a gold clip (or any other hair accessory you're digging) and position it just above the knot for a formal, polished look.

The model proved an undone updo can look sophisticated when she paired this messy knot with a classic lace Valentino gown. To pull off this look:

1. Apply a mousse (like Ouai Soft Mousse, $28) to damp strands and scrunch hair as you blow dry. This creates that sexy, beachy texture every one wants (and an essential element to this style).

2. Once dry, pull back pieces and loosely pin them at the nape of the neck. Keep in mind these pieces don't need to be uniform at the back of the head. In fact, they look better all over the place.

3. Spritz a firm-hold hairspray (we like Tresemme Mega Firm Tres Two Freeze Hairspray, $5.99) to finish the look. See? The chic style took you all of five minutes.

Though Mulligan's hair has grown significantly since her Gatsby pixie, it was still barely shoulder-length when she wore this knotted updo. To copy Mulligan's short hair updo:

1.Start by blow-drying your mane straight to give this updo a clean look. (If you want some added shine like Mulligan's, apply a hair serum like OGX Coconut Miracle Oil Penetrating Oil, $8.99.)

2. Pull hair into two ponytails (one high, one low).

3. Coil sections of each ponytail towards the center and secure with bobby pins.