Sienna Miller’s best-known tattoos are three small stars on her right shoulder and a bird on her wrist.
Sienna Miller’s Three-Star Shoulder Tattoo

Profiles place the stars on Miller’s right shoulder. They form a loose cluster, with space between them. The placement can show with an open neckline and stay covered under a T-shirt. Vogue’s profile identifies the three stars but doesn’t explain their meaning.
If you’re considering a similar cluster, spacing matters as much as the outline. Bring a few references to an artist and look at the design at its actual size on your shoulder. A drawing that reads clearly on screen can feel crowded when it’s scaled down.
Sienna Miller’s Wrist Swallow Tattoo

Vogue’s 2007 profile calls the wrist tattoo “Barry the bluebird,” after a Charles Bukowski poem. Other reports call it a swallow, so the sources don’t settle the species. The wrist is easy to see during the day. If you’re considering fine details there, ask an artist about line weight and look at healed examples before settling on a design.
Why Her Small Choices Work So Well

The shoulder cluster is made of simple points; the wrist tattoo has the outline and direction of a bird. That difference gives the two designs their own look. The Letterman-arrival photo here is for context; it doesn’t document her tattoos.
The Overall Sienna Miller Aesthetic

Some photos show the shoulder stars in a muted blue-gray tone. Lighting and editing can shift the color, so event portraits aren’t a reliable reference for ink shade. The silver-gown image here shows Miller’s styling rather than the tattoo itself.
Choosing a Dainty Mark Inspired by Sienna Miller

Choose an image you want to wear, whether it has personal meaning or simply appeals to you. Decide on the placement and size, then bring references to your artist. Ask for a drawing that fits the area and check the stencil at full size. Healed examples can give you a better sense of how fine lines look after the appointment.
How to Borrow the Look Without Copying It

Keep the small scale if that’s what appeals to you, then choose a subject of your own. You might pick a bird with a personal connection, or arrange a few different symbols in a loose cluster. A fine-line style can still feel personal when the image and its story come from you.