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She is known for her intense diet and fitness regime, which she often documents on her Instagram page.
But Millie Mackintosh treated herself to a cheat day on Saturday night, as she attended her pal Spencer Matthews' star-studded 30th birthday party.
Reality - Star - Glass - Champagne - Cigarette
The former reality star, 29, was spotted sipping a glass of champagne and puffing a cigarette, as she caught up with friends at the raucous bash.
The blonde looked typically chic in a silk white jumpsuit, which tied at the waist with a ribbon belt, as she mingled with guests at the bash.
Sunglasses - Head - Millie - Summer - Climes
Accessorising with dark sunglasses, which she perched atop her head, Millie proved to be embracing the summer climes as she joined the party outside, with a glass of champagne in hand.
Carrying a packet of cigarettes in the same hand, the beauty was then seen lighting up in the venue's smoking area as she laughed and joked with her company.
Millie - Boy - Spencer - Years - Made
Millie has known birthday boy Spencer for many years, having starred on Made In Chelsea together back in 2011.
Millie was best friends with his childhood sweetheart Caggie Dunlop, while she was dating his pal Hugo Taylor.
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