Every bride wants their wedding day to go off without a hitch and finding the perfect dress is key to making everything feel perfect.
Mackenna is determined she will have a real standout gown for her Anglo-Indian wedding to fiancé Eli and to help her she enlists the help of celebrity stylist Gok Wan.
She heads to the Ava Rose Hamilton Boutique with her entourage, including mum Ellen, sister Emma and sister-in-law Maryam.
Mackenna explains to Gok: "I do like the Boho type sort of feel. I love lace, I love where you can see a little bit skin, but I love back detail."
And she confesses that her wedding has got a little out of hand since she agreed to be Eli's wife.
Mackenna says: "It was meant to start as a small wedding, but then it escalated to about 280 guests."
Before long, Gok thinks he's found the perfect dress of the bride-to-be - a gorgeous, lacy gown with detailed sleeves and a matching headdress.
But Mackenna has some reservations, saying: "I’m not wowed, I feel like there’s something flat about it."
However she completely changes her mind when she sees herself in the stunning gown for the first time.
She said: "I do really love it, this is so beautiful, it’s got the Boho vibe."
Desperate to see what she's chosen her mum, sister and sister-in-law are all waiting anxiously downstairs.
And mum Ellen has some strong opinions on her daughter's perfect dress.
She said: "I don’t think it’s you."
But it's Mackenna's sister, Emma, who has the most brutal view.
She tells her: "It’s awful. I don’t like the waist, it made her look a bit like a rugby player."
"I feel like they aren’t taking into account what I want. I don’t think we need to say anything else."
But Gok has one more dress up his sleeve and tells Mackenna: "I think what we should do is some contrast. Let’s deliver on a big, showy, massive, in your face ballgown."
He shows her a beautiful, off-the-shoulder dress - and Maryam loves it.
She says: "Ok, I’m going to cry. This dress has absolutely blown me away."
And finally, her entourage agrees.
Mum Ellen says: "Absolutely gorgeous, I mean the smile on your face says it all."