Millie, 24, wore a vintage Alice Temperley lace wedding dress and towering Christian Louboutin peep-toe heels as she arrived at the ceremony on the arm of proud father Nigel. The bride carried a simple bouquet of white, cream and pink flowers and wore her hair in an elegant plaited updo.
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Her four bridesmaids included Charlotte De Carle, who previously appeared in the E4 reality show Dirty Sexy Things. The bridesmaids all wore floor-length dusky pink gowns.
The groom, whose real name is Stephen Paul Manderson, wore a blue suit and black tie. His childhood friend DJ Lewis Richards acted as his best man.
Babington House has hosted a number of celebrity weddings in the past, including the star-studded marriage between James Corden and his wife Julia Carey in September last year.
Pearl Lowe and Danny Goffrey, Natasha Kaplinsky and Justin Bower, and Zoe Ball and Fat Boy Slim are just some of the other celebrities who have celebrated their nuptials on the estate.
Ahead of her big day, former Made In Chelsea star Millie had been spending time with her family, and on Sunday revealed she was sitting down to watch her mum's wedding video.
Posting a screen grab of her mother in her dress, veil and floral headpiece, the bride-to-be wrote, "My mum's wedding video! Too cute."
Her soon-to-be husband, meanwhile, bid farewell to Twitter as he prepared to exchange his wedding vows.
"Thank you all for your kind wishes, as you may have read I'm marrying the love of my life tomorrow so I'm off for a little while, big love x," the 29-year-old musician wrote on Monday.
The happy couple have been together since February 2012. They announced their engagement in March 2013, with Millie confirming the news via Twitter posting a picture of her beautiful double-banded engagement ring.
"If I could scream loud enough for the whole world to hear I would," she wrote next to the photo.