Sienna Miller's Bold, Boho Maternity Style

Shortly before the birth of her first baby in July, a daughter with boyfriend Tom Sturridge, a very pregnant Sienna Miller gets comfy in a black sweater, gray leggings and blue oxfords for a June 24 al fresco lunch in London's Notting Hill.

For a May 31 night out in London, Miller shows off her bump in a simple but sleek black-and-white ensemble of a fitted tee, leggings and cream blazer, with edgy open-toe wedges.

Romantic and radiant! The 30-year-old actress glows in a flowing gray dress and sandals while leaving her May 27 baby shower at London's Soho House.

Returning to her boho roots, the trendsetter dresses her bump in a colorful print dress, crocheted vest, wide-brim hat and Isabel Marant suede ankle boots while out in London's Primrose Hill on May 24.

Showing off her mom-to-be curves in a figure-hugging gray dress and black sweater as she leaves Claridge's Hotel in London on May 14, the British beauty lets her accessories do the talking: sexy metallic peep-toe booties and Mulberry's in-demand Del Rey satchel.

Continuing the gray trend, the laid-back celeb layers a long-sleeve white lace top over a maxi dress on a May 6 pre-baby holiday in Portofino, Italy, with her 26-year-old English actor beau. “I’m feeling fine,” she says of her pregnancy in Vogue U.K.'s April issue. “It’s all progressing nicely and it’s very exciting.”

Known for her quirky outfits, Miller takes a casual cue in a relaxed red sweater, black cropped leggings, floppy hat and her go-to sage booties while strolling hand-in-hand with Sturridge in Portofino on May 6.

The expectant Alfie and Factory Girl actress adds flair to a casual belly-covering black-and-white striped top and jeans with a funky black cape while shooting an ad campaign in London on March 20.

Miller goes neutral in a tan jacket and black leggings while shopping with Sturridge in New York on March 6. A playful pop of color – Diane von Furstenberg’s neon mini Harper bag – enlivens the ensemble.

Showing off her changing shape, the fashion muse looks perfectly polished in DVF's delicate nude Zarita lace dress and a pretty pale pink coat while filming her latest movie, A Case of You, in Brooklyn, N.Y., on Feb. 17. She winterizes the delicate look with basic black tights.

Miller debuts her bump on the red carpet in a formfitting, halter-neck BOSS Black dress at a Feb. 14 New York screening of The Ever-Changing Face of Beauty. A metallic clutch, Pamela Love’s Ridge Cuff and sleek updo add an edge to the classic floor-length frock.