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

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  • Kendra Wilkinson

    The reality star is pregnant with her second child, a baby girl.

  • Olivia Wilde

    Wilde is expecting her first baby with fiance Jason Sudeikis.

  • Kelly Clarkson

    Clarkson announced her pregnancy on Twitter Nov. 19, 2013. She's expecting her first child with husband Brandon Blackstock.

  • Ginnifer Goodwin

    Goodwin and her fiance and "Once Upon A Time" co-star Josh Dallas are expecting their first child together.

  • Jenni "JWoww" Farley

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

  • Kenan Thompson And Wife

    The "SNL" star and his wife Christina Evangelina are set to welcome their first child.

  • Lil Kim

    Lil Kim debuted her baby bump during NYFW on Feb. 12.

  • Christina Aguilera

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

  • Jenna Fischer

    The former "Office" star is expecting her second child.

  • 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.

Earlier on HuffPost: