We've seen plenty of pregnant stars out and about lately, but we think Sienna Miller takes the cake for most stylish -- and adorable! -- mama-to-be.

The very pregnant actress was all smiles while out in north London Thursday, leaving a yoga class. She's expecting a baby this summer with her rumored fiance, Tom Sturridge, and she certainly has a beautiful glow to her these days.

Though Miller has stayed relatively mum about her pregnancy, she hasn't been shy about stepping out in all her pregnant glory. Last week she hit the town to celebrate her pal Robert Pattinson's 26th birthday.

Check out a photo of Miller's baby bump below, as well as other stars who are expecting:

sienna miller baby bump

Loading Slideshow...
  • Lake Bell

    Actress <a href="http://www.huffingtonpost.com/2014/04/24/lake-bell-pregnant_n_5204684.html" target="_blank">Lake Bell is pregnant</a> with her first child with husband Scott Campbell.

  • Gabby Hoffman

    "Girls" actress <a href="http://www.huffingtonpost.com/2014/06/07/gaby-hoffmann-pregnant_n_5466050.html" target="_blank">Gaby Hoffmann is expecting</a> her first child with cinematographer boyfriend Chris Dapkins.

  • Kourtney Kardashian

    Kourtney Kardashian is <a href="http://www.huffingtonpost.com/2014/06/04/kourtney-kardashian-pregnant_n_5444993.html" target="_blank">pregnant with her third child</a> with partner Scott Disick.

  • Jenni "JWoww" Farley

    JWoww, who's expecting her first child with fiance Roger Mathews in July, is set to welcome a little baby girl.

  • Christina Aguilera

    Aguilera is reportedly expecting her second child, her first with fiance Matthew Rutler.

  • Scarlett Johansson

    The actress is reportedly expecting her first baby with fiance, Romain Dauriac.

  • Mila Kunis

    Kunis is reportedly expecting her first child with fiance Ashton Kutcher.

  • Stacy Keibler

    Keibler is expecting her first child with new husband Jared Pobre.

  • Siri Pinter

    Carson Daly and longtime love Siri Pinter are expecting their third child.

  • Snooki

    Snooki is expecting her second baby with fiance Jionni LaValle.

  • Alyssa Milano

    Milano is expecting her second child, a baby girl, with husband David Bulgari.

  • Christina Ricci

    The actress is expecting her first child with husband James Heerdegen.

  • Rachel Bilson

    Bilson is reportedly expecting her first child with longtime boyfriend Hayden Christensen.

  • Kristen Bell

    Bell is expecting her second child with Dax Shepard.

Earlier on HuffPost: