The pregnant former reality TV star, 32, can be seen posing with her little girl during their getaway to the Greek island of Crete.
The star, who announced in June that she is expecting her second child with husband Hugo Taylor, looked incredible in a yellow bikini, while her one-year-old wears a one-piece in an identical shade.
In the relaxed image, taken on a sun-drenched beach, she also showed off her growing baby bump.
Mackintosh recently revealed her top tips for travelling by plane with a restless toddler, after sharing the last time she had gone abroad was as a three-month-old.
The star – who married her 35-year-old former Made In Chelsea co-star in 2018 – wrote: "Lots of snacks!! We did fruit/yogurt pouches for take off and landing to help with her ears (she didn’t seem to notice) raisins, rice cakes, cut up grapes, sliced chicken sausage (a favourite of hers) flapjack bites, melty puffs and half my sandwich.
"She seemed to have an endless appetite but I tried not to worry as letting her constantly nibble on something kept her calm and occupied."
The mother-of-one, who has disclosed that her second child is "due later this year", added: "We downloaded her favourite shows, Peppa Pig & Cocomelon onto the iPad but when she got bored I would bring out a new small toy or a book with lots of flaps gave her something to focus on."
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