She recently treated her fans to glimpses of her wild hen do with her gal pals on her social media account.
And Millie Mackintosh put on a more demure display as she reunited with her fiancé Hugo Taylor at the Epsom Racecourse for the 2018 Epsom Derby on Saturday afternoon.
The former Made In Chelsea star, 28, showcased her style savvy ways as she slipped her slimline figure into a satin blue jumpsuit, embellished with a belt with cinched at her waist.
Hand in hand: Millie Mackintosh put on a more demure display as she reunited with her fiancé Hugo Taylor at the Epsom Racecourse for the 2018 Epsom Derby on Saturday afternoon
Upping the style ante, the reality star tied in her statement ensemble with a black oversized boater hat, and accentuated her height in a pair of monochrome tie-up heels.
The blonde beauty ensured all eyes were on her striking outfit as she opted for minimal make-up, and wore her tresses in a poker straight fashion.
Millie and Hugo became engaged during a romantic trip to Greece in August last year, after one year of romance.
However, the pair have known each other since they were 16 and enjoyed a fiery six-month relationship in 2011, during their time on Made In Chelsea.
Fellow E4 stars Caggie and Rosie are believed to be bridesmaids at the wedding, alongside her close pal Zara Martin.
Despite dating on and off for years, the star recently revealed it took maturity and a number of wrong relationships for her and Hugo to realise they could work.
She explained to The Daily Mail’s YOU Magazine of their reconciliation: ‘We were both older, we were both in different places. He was respectful and sensitive, and I felt completely comfortable in his company.’
Revealing that the pair share the same goals in life, she added: ‘We both want children in a few years’ time.
‘We’re open to the idea of living in Los Angeles for a while and we’re both so happy to be together again. He’s the man I want to be married to for life.’
The couple confirmed they had reconciled their romance in May 2016, shortly after Millie’s divorce from rapper Professor Green.
The event marks the 239th annual running of the Derby horse race and is set to be worth £1.5million.